COMPARISON OF CRITICAL NUTRIENT CONCENTRATIONS WITH DRIS FOR ASSESSING NUTRIENT DEFICIENCIES OF POTATOES ON IRRIGATED CHERNOZEMIC SOILS

1989 ◽  
Vol 69 (2) ◽  
pp. 601-609 ◽  
Author(s):  
D. C. MacKAY ◽  
T. ENTZ ◽  
J. M. CAREFOOT ◽  
S. DUBETZ
Keyword(s):  
Field Experiments ◽  
Solanum Tuberosum L ◽  
Integrated System ◽  
Nutrient Concentrations ◽  
Fertilizer Treatment ◽  
Similar Response ◽  
Nutrient Deficiencies ◽  
Response Curves ◽  
Deficiency Indices ◽  
Leaf Analysis

Best fit quadratic response curves relating tuber yields with fertilizer treatment rates from a 3-yr 4 × 4 factorial field experiment provided the bases for diagnosing nutrient deficiencies of N and P. These curves were compared with similar response curves of leaf nutrient concentrations and for deficiency indices calculated by the Diagnosis and Recommendation Integrated System (DRIS). Critical nutrient concentrations (CNCs) of 5.93 and 5.44% of N and 0.47 and 0.35% of P were associated with estimated yield decrements of < 5% and > 15% of the maxima. Corresponding DRIS indices were −2.1 and −6.7 for N and −10 and −26 for P. Although there were no yield responses to applied K in 10 field experiments, 4 and 3% were selected as CNCs possibly indicative of K-supplying potential. Corresponding DRIS values were 5.6 and −17. When these CNC values were applied to 372 commercial fields sampled over an 8-yr period, there were 30, 44, and 12% in the top class for N, P, and K, respectively, while 34, 8, and 7% were in the bottom deficiency class. The DRIS system placed 41, 76, and 76% of the fields in the same deficiency classes for N, P, and K, respectively, but only 13, 0, and 0% differed by more than one class. There appeared to be limited potential advantages for the DRIS method of diagnosis.Key words: Solanum tuberosum L., leaf analysis, fertilizer rates, potato.

scholarly journals Fertilization response likelihood for the interpretation of leaf analyses

2012 ◽  
Vol 36 (2) ◽  
pp. 437-445 ◽  
Author(s):  
Celsemy Eleutério Maia
Keyword(s):  
Nutritional Status ◽  
Normal Distribution ◽  
Integrated System ◽  
High Yield ◽  
Nutrient Concentrations ◽  
Correct Interpretation ◽  
Leaf Analysis ◽  
Chemical Evaluation ◽  
Effective Use

Leaf analysis is the chemical evaluation of the nutritional status where the nutrient concentrations found in the tissue reflect the nutritional status of the plants. Thus, a correct interpretation of the results of leaf analysis is fundamental for an effective use of this tool. The purpose of this study was to propose and compare the method of Fertilization Response Likelihood (FRL) for interpretation of leaf analysis with that of the Diagnosis and Recommendation Integrated System (DRIS). The database consisted of 157 analyses of the N, P, K, Ca, Mg, S, Cu, Fe, Mn, Zn, and B concentrations in coffee leaves, which were divided into two groups: low yield (< 30 bags ha-1) and high yield (> 30 bags ha-1). The DRIS indices were calculated using the method proposed by Jones (1981). The fertilization response likelihood was computed based on the approximation of normal distribution. It was found that the Fertilization Response Likelihood (FRL) allowed an evaluation of the nutritional status of coffee trees, coinciding with the DRIS-based diagnoses in 84.96 % of the crops.

scholarly journals Foliar Fertilization as a Strategy to Increase the Proportion of Mature Pods in Peanut (Arachis hypogaea L.)

2019 ◽  
Vol 46 (2) ◽  
pp. 140-147
Author(s):  
A.K. Pierre ◽  
M.J. Mulvaney ◽  
D.L. Rowland ◽  
B. Tillman ◽  
T.L. Grey ◽  
...  
Keyword(s):  
Arachis Hypogaea ◽  
Vegetation Index ◽  
Field Experiments ◽  
Foliar Application ◽  
Nutrient Concentrations ◽  
Nutrient Deficiencies ◽  
Foliar Fertilization ◽  
Foliar Fertilizer ◽  
Arachis Hypogaea L ◽  
Crop Maturity

ABSTRACT Foliar application of nutrients is used by growers to remediate crop nutrient deficiencies, but anecdotal reports indicate there may be associated effects of accelerated crop maturity, particularly for irrigated peanut (Arachis hypogaea L.). Research was conducted to determine whether application of foliar fertilizers during early pod set could increase the proportion of early-maturing pods, and thereby increase the mature proportion of the profile under irrigated conditions. Field experiments were conducted in Florida at Citra in 2016, Jay in 2016 and 2017with a randomized complete block with four foliar fertilizer treatments, applied to GA-06G at R1 and again two wks later at R2. Treatments consisted of no foliar fertilizer (control), 10.0 kg N/ha, 1.0 kg P2O5/ha, and 0.34 kg B/ha at each application and two harvest timings. Harvest treatments were based on the adjusted growing degree d model for peanut and were timed to represent early and optimal crop maturity. Leaf tissue nutrient concentrations were determined from samples collected 24h after each foliar treatment application. Yield and proportion of mature pods were quantified after each digging date. Normalized difference vegetation index data showed no treatment differences. The maturity profile (percentage of mature pods present in the sample) was not consistently different from respective controls during either harvest period. Results indicate foliar fertilizer applied during flowering had little effect on maturity acceleration in peanut, though foliar fertilization may still be effective at alleviating in-season nutrient deficiencies. Within site-year, application of foliar fertilizer did not increase yield. Under sound soil fertility management programs, foliar fertilizers did not increase yield or the maturity profile of peanut.

Field studies of cadmium in potatoes (Solanum tuberosum L.). III. Response of cv. Russet Burbank to sources of banded potassium

1994 ◽  
Vol 45 (1) ◽  
pp. 243 ◽  
Author(s):  
LA Sparrow ◽  
AA Salardini ◽  
J Johnstone
Keyword(s):  
Field Experiments ◽  
Solanum Tuberosum L ◽  
Field Studies ◽  
Chloride Ions ◽  
Russet Burbank ◽  
Potassium Sulfate ◽  
Fertilizer Treatment ◽  
Cd Uptake ◽  
Sulfate Ions ◽  
Soil Adsorption

Six field experiments were conducted where Russet Burbank potatoes were grown with banded fertilizer consisting of diammonium phosphate (DAP) and either potassium sulfate (K2S04) or potassium chloride (KCl). At each site, rates of nitrogen (N), phosphorus (P) and potassium (K) were matched as closely as possible for each K fertilizer treatment. At four of the six sites, potatoes grown with K2S04 had tuber and petiole cadmium (Cd) concentrations 20-30% lower than did potatoes grown with KCl. The use of K2S04 instead of KCl appears to offer considerable promise as a means of decreasing tuber Cd uptake. Sulfate ions presumably promote increased soil adsorption of soil and/or fertilizer Cd compared with chloride ions, and so decrease Cd availability. We attributed the lack of difference in tuber and petiole Cd between K sources at two sites to either leaching, chloride in irrigation water, or at one site to a higher than desired rate of NPK fertilizer with the sulfate treatment. Any one of these may have offset decreases in Cd uptake due to the presence of sulfate ions.

Pituitary response to LRH and TRH stimulation and peripheral steroid hormones in conscious and anaesthetized adult male rhesus monkeys (Macaca mulatta)

1980 ◽  
Vol 93 (3) ◽  
pp. 287-293 ◽  
Author(s):  
E. Jean Wickings ◽  
E. Nieschlag
Keyword(s):  
Adult Male ◽  
Rhesus Monkeys ◽  
Serum Testosterone ◽  
Fold Increase ◽  
Serum Cortisol ◽  
Serum Levels ◽  
Biologically Active ◽  
Similar Response ◽  
Response Curves ◽  
Male Rhesus

Abstract. Adult male rhesus monkeys are aggressive animals and very difficult to handle. Hence experimental manipulations necessarily involve the use of restraint procedures, either chemical or physical, which may influence endocrine functions. Therefore, the effects of ketamine anaesthesia on basal hormone levels and on the pituitary response to LRH and TRH were investigated in 4 adult male rhesus monkeys. Values were compared to those obtained from the same animals restrained in primate chairs for approximately 48 h, a procedure to which they had been accustomed to over the preceding 6 months. Serum cortisol levels under anaesthesia were at all times lower than in conscious monkeys, but increased after 2 h to values twice as high as measured initially. Serum testosterone concentrations were not significantly different on the two occasions, but levels under anaesthesia were slightly higher initially than in the conscious monkeys, and decreased gradually over the 3 h test period. Initial prolactin levels were lower in the anaesthetized monkeys, and increased 2–3-fold after 90 min; values at 3 h were not significantly different from those in conscious monkeys. Intravenous TRH elicited a similar response in prolactin on both occasions, maximum values occurring after 15–30 min and returning to basal levels after 3 h. The maximum values attained and the area under the response curves were higher under anaesthesia. LRH stimulation resulted in a 15- and 30-fold increase in serum levels of biologically active LH, with and without anaesthesia, respectively. Basal levels were not significantly different on the two occasions. The area under the LH response curve was higher in 3 of the 4 monkeys without anaesthesia. The extent to which results in conscious monkeys are affected by stress is difficult to assess. Since neither handling technique allows for the collection of 'true' basal data, it is paramount to standardize and define the conditions under which experiments, and even routine blood sampling, are performed in male rhesus monkeys.

scholarly journals A Real-Time Weed Mapping and Precision Herbicide Spraying System for Row Crops

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4245 ◽  
Author(s):  
Yanlei Xu ◽  
Zongmei Gao ◽  
Lav Khot ◽  
Xiaotian Meng ◽  
Qin Zhang
Keyword(s):  
Real Time ◽  
Field Experiments ◽  
Particle Swarm ◽  
Error Rates ◽  
Integrated System ◽  
Central Processor ◽  
Time Data ◽  
Weed Detection ◽  
Row Crops ◽  
Weed Mapping

This study developed and field tested an automated weed mapping and variable-rate herbicide spraying (VRHS) system for row crops. Weed detection was performed through a machine vision sub-system that used a custom threshold segmentation method, an improved particle swarm optimum (IPSO) algorithm, capable of segmenting the field images. The VRHS system also used a lateral histogram-based algorithm for fast extraction of weed maps. This was the basis for determining real-time herbicide application rates. The central processor of the VRHS system had high logic operation capacity, compared to the conventional controller-based systems. Custom developed monitoring system allowed real-time visualization of the spraying system functionalities. Integrated system performance was then evaluated through field experiments. The IPSO successfully segmented weeds within corn crop at seedling growth stage and reduced segmentation error rates to 0.1% from 7.1% of traditional particle swarm optimization algorithm. IPSO processing speed was 0.026 s/frame. The weed detection to chemical actuation response time of integrated system was 1.562 s. Overall, VRHS system met the real-time data processing and actuation requirements for its use in practical weed management applications.

The interaction between soil pH and phosphorus for wheat yield and the impact of lime-induced changes to soil aluminium and potassium

Soil Research ◽  
2017 ◽  
Vol 55 (4) ◽  
pp. 341 ◽  
Author(s):  
Craig A. Scanlan ◽  
Ross F. Brennan ◽  
Mario F. D'Antuono ◽  
Gavin A. Sarre
Keyword(s):  
Grain Yield ◽  
Soil Ph ◽  
Field Experiments ◽  
Wheat Yield ◽  
Acid Soils ◽  
Combined Effect ◽  
Additive Effect ◽  
Yield Response ◽  
Response Curves ◽  
The Impact

Interactions between soil pH and phosphorus (P) for plant growth have been widely reported; however, most studies have been based on pasture species, and the agronomic importance of this interaction for acid-tolerant wheat in soils with near-sufficient levels of fertility is unclear. We conducted field experiments with wheat at two sites with acid soils where lime treatments that had been applied in the 6 years preceding the experiments caused significant changes to soil pH, extractable aluminium (Al), soil nutrients and exchangeable cations. Soil pH(CaCl2) at 0–10cm was 4.7 without lime and 6.2 with lime at Merredin, and 4.7 without lime and 6.5 with lime at Wongan Hills. A significant lime×P interaction (P<0.05) for grain yield was observed at both sites. At Merredin, this interaction was negative, i.e. the combined effect of soil pH and P was less than their additive effect; the difference between the dose–response curves without lime and with lime was greatest at 0kgPha–1 and the curves converged at 32kgPha–1. At Wongan Hills, the interaction was positive (combined effect greater than the additive effect), and lime application reduced grain yield. The lime×P interactions observed are agronomically important because different fertiliser P levels were required to maximise grain yield. A lime-induced reduction in Al phytotoxicity was the dominant mechanism for this interaction at Merredin. The negative grain yield response to lime at Wongan Hills was attributed to a combination of marginal soil potassium (K) supply and lime-induced reduction in soil K availability.

Potential of plant extracts in combination with bacterial antagonist treatment as biocontrol agent of red rot of sugarcane

2007 ◽  
Vol 53 (2) ◽  
pp. 196-206 ◽  
Author(s):  
V. Jayakumar ◽  
R. Bhaskaran ◽  
S. Tsushima
Keyword(s):  
Plant Extracts ◽  
Field Experiments ◽  
Curcuma Longa ◽  
Saccharum Officinarum ◽  
Red Rot ◽  
Colletotrichum Falcatum ◽  
Similar Response ◽  
Red Rot Disease ◽  
Leaf Extracts ◽  
Rot Disease

Plant extracts and antifungal microorganisms were tested singly and in combination for biocontrol of sugarcane red rot disease ( Colletotrichum falcatum ) using two sugarcane ( Saccharum officinarum L.) cultivars, CoC671 and CoC92061, in pot and field experiments. Leaf extracts of Abrus precatorius and Bassia latifolia and the rhizome extract of Curcuma longa reduced Colletotrichum falcatum mycelial growth by 80%, 58%, and 57%, respectively. Although sugarcane- planting materials (setts) treated individually with either Pseudomonas fluorescens Md1 or A. precatorius in pot experiments had the lowest incidences of red rot, 20.1% and 24.2%, respectively, none of the plant extracts were effective in the field. In contrast, when the two varieties were tested separately in two field locations, the setts treated with A. precatorius in combination with a spray or soil application of P. fluorescens Md1 had the lowest incidence of red rot in both locations, e.g., 3.1% and 3.4% incidence for CoC92061 in one location, and had a similar response to the chemical control. The results suggest the applicability of plant-based extracts for the suppression of sugarcane red rot disease in the field as an environment-friendly tool in combination with antagonists.

NORMS FOR MULTIVARIATE DIAGNOSIS OF NUTRIENT IMBALANCE IN ARABICA AND ROBUSTA COFFEE IN THE EAST AFRICAN HIGHLANDS

2012 ◽  
Vol 48 (3) ◽  
pp. 448-460 ◽  
Author(s):  
L. W. I. WAIREGI ◽  
P. J. A. VAN ASTEN
Keyword(s):  
Integrated System ◽  
Coefficient Of Determination ◽  
High Yield ◽  
Nutrient Deficiencies ◽  
East African ◽  
Nutrient Imbalance ◽  
Nutrient Imbalances ◽  
Using Data ◽  
East African Highlands ◽  
The Relationship

SUMMARYPoor soil fertility is a constraint to coffee production. Targeting fertiliser recommendations to nutrient deficiencies can contribute to improved crop response to fertiliser. This study aimed to derive and compare the Compositional Nutrient Diagnosis (CND) and Diagnosis and Recommendation Integrated System (DRIS) norms for Arabica and Robusta, and to investigate nutrient interactions using data derived from 164 plots. The high-yield sub-populations of Arabica had significantly (p < 0.01) higher P (0.23 vs. 0.14) and K (2.87 vs. 2.04), and lower N (2.96 vs. 3.61), Ca (0.99 vs. 1.50) and Mg (0.40 vs. 0.23) than those of Robusta. With respect to the CND norms, Arabica had significantly (p < 0.001) higher P and K, and lower N, Ca and Mg means of row-centered log ratios than Robusta. The relationship between the CND and DRIS indices had coefficient of determination (R2) = 0.75–0.99 for both coffee types. The relationship between nutrient imbalance indices for CND and DRIS had R2 of 0.95 (Arabica) and 0.76 (Robusta). Both coffee types had negative N–Ca, P–Mg and K–Mg interactions. Arabica had positive N–Mg and K–Ca interactions and Robusta had positive N–K, P–K and Ca–Mg interactions and negative N–P, N–Mg, P–Ca and K–Ca interactions. The study concludes, there is a need for cultivar-specific norms, but such norms developed under one set of conditions may not be applicable under different conditions. The study also concludes that both CND and DRIS can be used to determine nutrient imbalances, and fertiliser requirements could be cultivar-specific.

scholarly journals Capacity of Caulerpa lentillifera in the Removal of Fish Culture Effluent in a Recirculating Aquaculture System

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 440 ◽  
Author(s):  
B. V. A. S. Manori Bambaranda ◽  
Takuji W. Tsusaka ◽  
Anong Chirapart ◽  
Krishna R. Salin ◽  
Nophea Sasaki
Keyword(s):  
C:N Ratio ◽  
Integrated System ◽  
Inorganic Nutrients ◽  
Fish Culture ◽  
Nutrient Concentrations ◽  
Expert Committee ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
Caulerpa Lentillifera ◽  
Aquaculture Effluent

Aquaculture is one of the fastest growing food producing industries in the world. Aquaculture effluent contains high concentrations of inorganic nutrients. Reduction of these inorganic nutrients in aquaculture effluent is crucial for fulfilling the effluent standards or reuse of aquaculture effluent. This study investigated the effective use of green macroalga Caulerpa lentillifera as a bioremediatory species for nutrient removal from aquaculture effluent by conducting an on-station experiment and measurements. The effluent of a fish culture unit was circulated through a macroalgal culture unit every four days for a total of 60 days, allowing 15 circulations. Concentrations of inorganic nutrients (NO2−-N, NO3−-N, NH3-N, and PO43−) were measured in the integrated system consisting of a fish unit, settling unit, macroalgal unit and extra tank for water circulation in triplicates. Multiple linear regression analysis revealed that the application of the bioremediation system led to a significant reduction in nutrient concentrations within one day, and slightly further in the following two days. On average over the 15 circulations, the first one day of application decreased the concentrations of NO2−-N, NO3−-N, NH3-N, and PO43− by 0.247 mg/L, 81.6 mg/L, 0.682 mg/L, and 0.352 mg/L, respectively. Furthermore, the C:N ratio of macroalgae decreased during the 60-day application period, providing evidence of the nutrient uptake by macroalgae. Based on the European Union (EU) standard and quality criteria of France and the Joint FAO/WHO Expert Committee (JFWEC), the macroalgae grown in the integrated system were at the safe level for human consumption in terms of contents of Cd, Pb, and As. The results of our study imply that recirculating aquaculture systems utilizing C. lentillifera for biofiltration have the potential for effective treatment of aquaculture effluent integrating fish and macroalgae production.

scholarly journals Potato nutritional status at the onset of tuberisation – a yield prediction tool

2020 ◽  
Vol 66 (No. 2) ◽  
pp. 86-92 ◽  
Author(s):  
Karolina Frąckowiak ◽  
Jarosław Potarzycki ◽  
Witold Grzebisz ◽  
Witold Szczepaniak
Keyword(s):  
Nutritional Status ◽  
Field Experiments ◽  
Tuber Yield ◽  
Integrated System ◽  
Path Analyses ◽  
Positive Balance ◽  
Complex Statistical Analysis ◽  
N Fertilisers ◽  
N Rates ◽  
Single Predictor

A reliable tuber yield prognosis requires a complex statistical analysis of potato nutritional status in the fully developed 4<sup>th</sup> leaf at the onset of tuberisation. This hypothesis was validated in the series of field experiments conducted in 2006–2008 in Poland. The experimental design was composed of two nitrogen (N) rates (60, 120 kg/ha), two N fertilisers (Urea and Agrotain), two rates of sulfur (0, 50 kg/ha). The marketable tuber yield of cv. Zeus ranged from 31.3 to 59.3 t/ha in 2008 and 2006, respectively. Despite annual variability, the potato presented a good nutritional status. In 2008, the contents of N, Mg, Cu and Zn were about 33% lower as compared to 2006. The stepwise and path analyses indicated N, Mg and Cu as the key yield-limiting nutrients. The diagnosis and recommendation integrated system (DRIS) showed that a slight imbalance of N and Mg did not disturb tuber yield, provided a positive balance of K was maintained. The Mg index, as a result of the DRIS procedure, emerged as the best single predictor of potato yield.  

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