scholarly journals Morphological and physiological performance of PSB Rc18 lowland rice (Oryza sativa L.) grown at different water, spacing and nutrient management

2019 ◽  
pp. 76-99
Author(s):  
Ruth Escasinas ◽  
Oscar Zamora
Keyword(s):  
Nutrient Management ◽  
Oryza Sativa L ◽  
Crop Productivity ◽  
Cell Number ◽  
Lowland Rice ◽  
Growth Stages ◽  
Area Index ◽  
Physiological Performance ◽  
Rice Plants ◽  
Continuous Flooding

Rice yield fluctuates because of environmental influences on morphological and physiological processes, as well as inadequate human intervention, to stabilize crop productivity. A field experiment was conducted in two cropping seasons at the experimental area of the Department of Agronomy, Visayas State University, Baybay, Leyte to evaluate the morphological and physiological performance of lowland rice grown at different water, spacing and nutrient management. Different sources of fertilizers were designated as the mainplot and plant spacing as the subplot nested within two water regimes, ie, continuous flooding and no flooding. Lowland rice s under no flooding were shorter than those under plant continuous flooding. No flooding gave higher root pulling resistance, crop growth rate, net assimilation rate, leaf area index and harvest index and consequently produced higher grain yield of PSB Rc18. No flooding and continuous flooding water management resulted in the formation of aerenchyma cells in roots of rice plants which had statistically similar cell number and measurement. Wider spacing of 40cmx40cm gave the highest RPR. Water, spacing and nutrient management did not influence the phyllochron and total number of leaves on the main culm of PSB Rc18. However, PSB Rc18 at early growth stages tended to have longer phyllochron because of transplanting shock. No flooding, application of composted goat manure and closer spacing of 20cmx20cm is the best treatment combination that g ve similar yield to rice plants a applied with inorganic fertilizer at the rate of 90-30-30kg ha-1 N, P2O5, K2O.

scholarly journals Morphological and physiological performance of PSB Rc18 lowland rice (Oryza sativa L.) grown at different water, spacing and nutrient management

2019 ◽  
pp. 76-99
Author(s):  
Ruth Escasinas ◽  
Oscar Zamora
Keyword(s):  
Nutrient Management ◽  
Oryza Sativa L ◽  
Crop Productivity ◽  
Cell Number ◽  
Lowland Rice ◽  
Growth Stages ◽  
Area Index ◽  
Physiological Performance ◽  
Rice Plants ◽  
Continuous Flooding

Rice yield fluctuates because of environmental influences on morphological and physiological processes, as well as inadequate human intervention, to stabilize crop productivity. A field experiment was conducted in two cropping seasons at the experimental area of the Department of Agronomy, Visayas State University, Baybay, Leyte to evaluate the morphological and physiological performance of lowland rice grown at different water, spacing and nutrient management. Different sources of fertilizers were designated as the mainplot and plant spacing as the subplot nested within two water regimes, ie, continuous flooding and no flooding. Lowland rice s under no flooding were shorter than those under plant continuous flooding. No flooding gave higher root pulling resistance, crop growth rate, net assimilation rate, leaf area index and harvest index and consequently produced higher grain yield of PSB Rc18. No flooding and continuous flooding water management resulted in the formation of aerenchyma cells in roots of rice plants which had statistically similar cell number and measurement. Wider spacing of 40cmx40cm gave the highest RPR. Water, spacing and nutrient management did not influence the phyllochron and total number of leaves on the main culm of PSB Rc18. However, PSB Rc18 at early growth stages tended to have longer phyllochron because of transplanting shock. No flooding, application of composted goat manure and closer spacing of 20cmx20cm is the best treatment combination that g ve similar yield to rice plants a applied with inorganic fertilizer at the rate of 90-30-30kg ha-1 N, P2O5, K2O.

scholarly journals Combining Color Indices and Textures of UAV-Based Digital Imagery for Rice LAI Estimation

2019 ◽  
Vol 11 (15) ◽  
pp. 1763 ◽  
Author(s):  
Songyang Li ◽  
Fei Yuan ◽  
Syed Tahir Ata-UI-Karim ◽  
Hengbiao Zheng ◽  
Tao Cheng ◽  
...  
Keyword(s):  
Digital Images ◽  
Oryza Sativa L ◽  
Accuracy Assessment ◽  
Stem Elongation ◽  
Growth Stages ◽  
Digital Imagery ◽  
Area Index ◽  
Practical Applications ◽  
Color Indices ◽  
Promising Solution

Leaf area index (LAI) is a fundamental indicator of plant growth status in agronomic and environmental studies. Due to rapid advances in unmanned aerial vehicle (UAV) and sensor technologies, UAV-based remote sensing is emerging as a promising solution for monitoring crop LAI with great flexibility and applicability. This study aimed to determine the feasibility of combining color and texture information derived from UAV-based digital images for estimating LAI of rice (Oryza sativa L.). Rice field trials were conducted at two sites using different nitrogen application rates, varieties, and transplanting methods during 2016 to 2017. Digital images were collected using a consumer-grade UAV after sampling at key growth stages of tillering, stem elongation, panicle initiation and booting. Vegetation color indices (CIs) and grey level co-occurrence matrix-based textures were extracted from mosaicked UAV ortho-images for each plot. As a solution of using indices composed by two different textures, normalized difference texture indices (NDTIs) were calculated by two randomly selected textures. The relationships between rice LAIs and each calculated index were then compared using simple linear regression. Multivariate regression models with different input sets were further used to test the potential of combining CIs with various textures for rice LAI estimation. The results revealed that the visible atmospherically resistant index (VARI) based on three visible bands and the NDTI based on the mean textures derived from the red and green bands were the best for LAI retrieval in the CI and NDTI groups, respectively. Independent accuracy assessment showed that random forest (RF) exhibited the best predictive performance when combining CI and texture inputs (R2 = 0.84, RMSE = 0.87, MAE = 0.69). This study introduces a promising solution of combining color indices and textures from UAV-based digital imagery for rice LAI estimation. Future studies are needed on finding the best operation mode, suitable ground resolution, and optimal predictive methods for practical applications.

scholarly journals Ratooning Response of Lowland Rice NSIC Rc352 (Oryza sativa L.) to Method of Nitrogen Application

2020 ◽  
Vol 8 (2) ◽  
pp. 63-74
Author(s):  
Dionesio Banoc ◽  
Keyword(s):  
Oryza Sativa L ◽  
Block Design ◽  
N Fertilization ◽  
Lowland Rice ◽  
Ratoon Crop ◽  
N Application ◽  
Area Index ◽  
High Productivity ◽  
Days To Heading ◽  
Randomized Complete Block Design

This study seeks to determine the effect of N fertilization method on ratoon lowland rice performance, to choose a fertilization method that provides high ratooned yield, and to assess its profitability adopting N fertilization method. The experiment lays out in a Randomized Complete Block Design with three replications and five N fertilization methods as treatments. Method of N application significantly affected the number of days to heading and maturity, plant height, leaf area index (LAI), number of productive tillers hill-1, panicle length and weight, number of filled and unfilled grains panicle-1. This method compensates cost of production of growing ratoon crop than those of the main crop. In fact, the highest profit (PhP25,564.80) was obtained in ratooned plants, which received 60 kg ha-1 N basal + 30 kg ha-1 N topdress application (T3) due to higher grain yield. Thereby, this is an appropriate option that provides high productivity and income for the ratoon growers.

scholarly journals Effect of integrated nutrient management on nitrogen dynamics in soil of rice -potato based cropping sequence

2015 ◽  
Vol 7 (2) ◽  
pp. 652-655
Author(s):  
Biplab Pal ◽  
Sajal Pati ◽  
Shrikant Badole ◽  
Venkateshwarlu Malothu ◽  
P. K. Patra
Keyword(s):  
Nitrogen Availability ◽  
Nutrient Management ◽  
Crop Productivity ◽  
Nitrogen Dynamics ◽  
Organic Manure ◽  
Growth Stages ◽  
Integrated Nutrient Management ◽  
Fertility Status ◽  
Cropping Sequence ◽  
Different Growth Stages

The integrated nutrient management (INM) has profound influence on sustaining crop productivity and fertility status of soil. The manurial field experiment was conducted at Paschim Medinipur, West Bengal for evaluating the performance of chemical fertilizer and organic manure on nitrogen availability in different forms in soil and also on the content of nitrogen in different parts of rice (Oryza sativa cv. Annada) and potato (Solanum tuberosum cv. Kufrijyoti) during different growth stages. Application of FYM and RDF150 in combination had good impact on nitrogen dynamics related to crop growth among other treatment combinations. FYM and RDF150 alone also imparted good impact on nutrient availability and yield of two experiment crops (rice and potato). Experiment revealed that incorporation of commercial concentrated organic manure with RDF150 exerted good impact besides FYM combination with inorganic fertilizers.

scholarly journals Growth and Physiological Performance of Aerobic and Lowland Rice as Affected by Water Stress at Selected Growth Stages

Rice Science ◽  
2018 ◽  
Vol 25 (2) ◽  
pp. 82-93 ◽  
Author(s):  
Nadzariah Kamarul Zaman ◽  
Mohd Yusoff Abdullah ◽  
Sariam Othman ◽  
Nadzirah Kamarul Zaman
Keyword(s):  
Water Stress ◽  
Lowland Rice ◽  
Growth Stages ◽  
Physiological Performance

scholarly journals Integrated Nutrient Management Enhances Soil Quality and Crop Productivity in Maize-Based Cropping System

2020 ◽  
Vol 12 (23) ◽  
pp. 10214
Author(s):  
Muhammad Abid ◽  
Tahira Batool ◽  
Ghulam Siddique ◽  
Shafaqat Ali ◽  
Rana Binyamin ◽  
...  
Keyword(s):  
Soil Quality ◽  
Crop Production ◽  
Nutrient Management ◽  
Cropping Systems ◽  
Cropping System ◽  
Crop Productivity ◽  
Mineral Fertilizers ◽  
Growth Stages ◽  
Organic Manures ◽  
Crop Growth Stages

Soil quality deterioration, especially in intensive cropping systems, has become a serious problem for crop productivity; consequently, strategies for sustainable crop production and soil health are urgently required. Experiments on fields were organized to investigate the impact of organic manures on crop productivity, soil physiochemical properties and soil water availability in a maize-based cropping system. The experiment consisted of five treatments, including organic manures (OM) and inorganic nitrogen, phosphorus and potassium (NPK) fertilizers applied separately and in combinations: NPK = 250-150-125 Kg/ha (recommended rate), farmyard manure (FYM) = 16 t/ha, poultry manure (PM) = 13 t/ha, NPK + FYM = 150-85-50 Kg/ha + 8.5 t/ha and NPK + PM = 150-85-50 Kg/ha + 7.0 t/ha. The results showed that the combination of OM with mineral fertilizers increased crop productivity, fertilizer use efficiency and yield sustainability indices over the treatments amended with sole application of mineral fertilizers and OM. The analysis of undisturbed soil samples during different crop growth stages revealed that the addition of OM decreased the bulk density and increased the pore volume of soil at the beds of 0–20 and 20–40 cm. The application of OM to the soil not only increased saturated hydraulic conductivity of the soil but also improved total available and readily available water contents to the plants, especially when FYM was included at 16 t ha−1. Soil-water retention properties recorded over the entire seven-day monitoring period following irrigation in the OM-amended treatments were consistently higher than the sole mineral NPK application treatments. When testing the soil nutrient status during different crop growth stages, it was noted that by adding OM into the soil not only the status of the organic carbon of soil, extractable N and K and available P contents is increased, but the duration of their availability to the plants are also enhanced. The results of the study show that organic manures addition is of major significance for maintaining soil quality and crop production sustainably, and should be advocated in the nutrient management strategies of intensive water- and nutrient-demanding cropping systems.

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