Using Soil Potassium Adsorption and Yield Response Models to Determine Potassium Fertilizer Rates for Potato Crop on a Calcareous Soil in Pakistan

2011 ◽  
Vol 42 (6) ◽  
pp. 645-655 ◽  
Author(s):  
Abdul Hannan ◽  
M. Arif ◽  
A. M. Ranjha ◽  
A. Abid ◽  
X. H. Fan ◽  
...  
Keyword(s):  
Calcareous Soil ◽  
Potato Crop ◽  
Yield Response ◽  
Potassium Fertilizer ◽  
Response Models ◽  
Soil Potassium ◽  
Fertilizer Rates

RELEASE OF NON-EXCHANGEABLE SOIL POTASSIUM BY RESIN-EQUILIBRATION AND ITS SIGNIFICANCE FOR CROP GROWTH

1962 ◽  
Vol 42 (2) ◽  
pp. 266-272 ◽  
Author(s):  
T. E. Barber ◽  
B. C. Matthews
Keyword(s):  
Linear Regression ◽  
Ammonium Acetate ◽  
Cation Exchange Resin ◽  
Yield Response ◽  
Exchangeable Potassium ◽  
Quadratic Regression ◽  
Potassium Fertilizer ◽  
Crop Response ◽  
Soil Potassium ◽  
The Difference

The non-exchangeable potassium released by soil after equilibration with cation-exchange resin was determined by extraction of the mixture with neutral ammonium acetate at room temperature and compared with a similar extraction in the absence of resin. The difference obtained following a 2-day equilibration period was called moderately-available potassium.Simple linear regression of yield on exchangeable potassium or exchangeable plus moderately-available potassium accounted for only 16 and 27 per cent respectively of the variability in yield response of corn, wheat, oats and potatoes to potassium fertilizer in the field. Multiple linear regression of yield on exchangeable and moderately-available potassium accounted for an average of 37 per cent of the variation in crop response; but a multiple quadratic regression of Log (100-per cent yield) on exchangeable and moderately-available potassium accounted for an average of 56 per cent of the variability in Log (100-per cent yield). Multiple quadratic regression of absolute yield or per cent yield on exchangeable and moderately-available potassium accounted for 46 and 50 per cent, respectively, of the variability in crop response to potassium fertilizer.

scholarly journals Yield Response of an Ensemble of Potato Crop Models to Elevated CO2 in Continental Europe

2021 ◽  
Vol 126 ◽  
pp. 126265
Author(s):  
David H. Fleisher ◽  
Bruno Condori ◽  
Carolina Barreda ◽  
Herman Berguijs ◽  
Marco Bindi ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Potato Crop ◽  
Yield Response ◽  
Crop Models

scholarly journals Tuber yield and economic result of ‘Atlantic’ potato in response to NPK fertilizer formulas

2019 ◽  
Vol 37 (4) ◽  
pp. 379-383
Author(s):  
Renato Yagi ◽  
Rogério P Soratto ◽  
Nilceu RX de Nazareno ◽  
Henrique L da Silva ◽  
Alexandre de C Dzierwa
Keyword(s):  
Specific Gravity ◽  
Soil Fertility ◽  
Tuber Yield ◽  
Potato Crop ◽  
Block Design ◽  
Operational Efficiency ◽  
Marketable Tuber ◽  
Randomized Complete Block Design ◽  
Npk Fertilizer ◽  
Fertilizer Rates

ABSTRACT The usual application of high 4-14-8 NPK fertilizer rates in the potato planting furrows, independently of the soil fertility or nutritional cultivar requirements, has become a paradigm in Brazil. However, the 4-14-8 NPK formula does not always meet the crop needs, and can unbalance the availability of nutrients in the soil. The objective of this study was to evaluate the tuber yield and economic results of ‘Atlantic’ potato as affected by rates of 4-14-8 and 6-30-6 NPK formulas applied in the planting furrows. The rates of both NPK formulas were calculated to reach P2O5 rates of 210, 420, and 630 kg ha-1. At each P2O5 rate, the 6-30-6 formula resulted in less 30% N and 65% K2O in the planting furrow compared to 4-14-8 formula. A randomized complete block design in a factorial scheme (2×3)+1, including an unfertilized furrow control, with three replications was used. Only the use of 6-30-6 formula increased the total tuber yield of ‘Atlantic’ potato. The marketable tuber yield reached higher levels (29.8 t ha-1) with higher P2O5 rate (440 kg ha-1) using the 6-30-6 than 4-14-8 formula. The fertilizer rates and formulas NPK did not affect specific gravity of marketable tubers. Therefore, the use of a fertilizer more concentrated in P2O5 that favors smaller contributions of N and K (as the 6-30-6 formula studied in this work) provides lower costs, and greater operational efficiency and profits in relation to the 4-14-8 formula traditionally used for the potato crop.

Yield response of watermelon (Citrullus lanatus Thunb.) cultivars to varied fertilizer rates in Rwanda

2021 ◽  
Vol 23 (2) ◽  
pp. 219-223
Author(s):  
A. Ndereyimana ◽  
A.N. Niyokuri ◽  
B.W. Waweru ◽  
B. Kagiraneza ◽  
P. Rukundo ◽  
...  
Keyword(s):  
Citrullus Lanatus ◽  
Yield Response ◽  
Fertilizer Rates

Response of mown pasture to potassium fertilizer in south-eastern South Australia

1977 ◽  
Vol 17 (88) ◽  
pp. 765 ◽  
Author(s):  
AP Meissner ◽  
AL Clarke
Keyword(s):  
South Australia ◽  
Subterranean Clover ◽  
Multivariate Regression Analysis ◽  
Magnesium Concentration ◽  
Yield Response ◽  
Regression Equations ◽  
Potassium Fertilizer ◽  
Factors Affecting ◽  
Yield And Quality

Trials lasting three years were conducted at 27 sites in the south-east of South Australia to examine the responses of mown subterranean clover-ryegrass pastures to repeated annual applications of potassium chloride. At 20 sites, yield of dry matter (DM) was increased by potassium in one or more harvests. Responses were measured in 9 out of 55 winter harvests and 42 out of 86 spring harvests; mean responses to 100 kg ha-1 KCl (-Y100) at responsive sites were 380 and 560 kg DM ha-1 in winter and spring respectively. When potassium dressing increased yield, the proportion of clover in the sward was either maintained or increased. The herbage concentration of potassium was usually increased, and its magnesium concentration sometimes depressed, by potassium application. Although the K:Mg ratio was thereby increased, especially during winter, it rarely reached 15, the value considered necessary to induce grass tetany in cattle. Multivariate regression analysis showed that the exchangeable potassium concentration (Kex) of the top 10 cm of soil, the depth of soil overlying clay or limestone, and the sand content of the topsoil were factors affecting yield response. The best regression equations, however, explained less than half of the response variations. In practice, Kex alone would have usefully diagnosed potassium responsive sites. Responses occurred often when Kexwas less than 0.2 me 100 g-1 and rarely when it was greater. The use of potassium fertilizer is likely to be worthwhile to establish new pasture, to maintain the clover content of old pasture, and to increase the yield and quality of hay, where soils have less than 0.20 me 100 g-1 Kex. Such soils are most commonly sands more than 30 cm deep.

EXCHANGEABLE AND WATER-SOLUBLE POTASSIUM IN SOILS AND DEGREE OF SATURATION IN RELATION TO TOMATO YIELDS

1959 ◽  
Vol 39 (2) ◽  
pp. 129-135 ◽  
Author(s):  
R. L. Halstead ◽  
H. B. Heeney
Keyword(s):  
Sandy Loam ◽  
Clay Content ◽  
Field Trials ◽  
Water Soluble ◽  
Degree Of Saturation ◽  
Yield Response ◽  
Clay Loam ◽  
Exchangeable Potassium ◽  
Potassium Fertilizer ◽  
Prince Edward County

In 33 field trials on soils varying in texture from sandy loam to clay loam in Prince Edward County, Ontario, exchangeable potassium, per cent potassium saturation, and water-soluble potassium were significantly correlated with yield response of tomatoes to potassium fertilizer on the sandy loam soils, but there was no correlation within the loam and clay loam groups. The mean c1 value in the modified Mitscherlich equation relating exchangeable potassium to yield response within the sandy loam group was 0.00555 and the coefficient of variation was 19.8 per cent. The corresponding coefficients for c1 values based on per cent potassium saturation and water-soluble potassium were of greater magnitude. The amounts of potassium soluble in boiling 1 N HNO3 were not related to yield response.Exchangeable potassium and the non-exchangeable form soluble in boiling 1 N HNO3 increased, whereas water-soluble potassium decreased with increasing clay content of the samples. Water-soluble potassium was significantly correlated with per cent potassium saturation within the sandy loam and loam groups.

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