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Effect of split application of potassium on growth, yield and potassium accumulation by soybean (1994)

Kolar, Jaspinder Singh ; Grewal, Harsharn Singh

Springer

Nutrient cycling in agroecosystems 39 (1994), S. 217-222

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ISSN: 1573-0867

Keywords: growth ; K accumulation ; K nutrition ; physiological efficiency ; soybean ; yield

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Field experiments were conducted during 1989 to 1991 on a loamy sand (Typic ustochrept) soil to study the K nutrition of soybean. Soybean responded significantly up to 50 kg K ha−1 when applied 1/2 of K at planting and 1/2 at flower initiation (two split) or applying 1/3 K at planting, 1/3 at flower initiation and 1/3 at pod development (three splits). Split application was more beneficial than applying full K at time of planting due to higher leaf area index, crop growth rate, chlorophyll content of fresh leaves, K accumulation in soybean and better agronomic and physiological efficiency of applied K. Agronomic efficiency, physiological efficiency and apparent recovery of K reduced as rate of applied K was increased from 50 to 75 kg ha−1. Highest K+ concentration (3.4 % of dry matter) was recorded in 30-day-old plants at 75 kg K ha−1 which depressed progressively with the age of the crop. At maturity, the K concentration of soybean seed varied from 1.5% (unfertilised K plants) to 2.1 % (when 75 kg K ha−1 was applied in three splits).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00750249

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Phosphorus management of a rice-wheat cropping system (1989)

Kolar, Jaspinder Singh ; Grewal, Harsharn Singh

Springer

Nutrient cycling in agroecosystems 20 (1989), S. 27-32

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ISSN: 1573-0867

Keywords: Cropping system ; phosphorus ; rice ; wheat

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract A long term field experiment was conducted on a sandy loam soil from 1983 to 1987 to determine how to best apply phosphorus fertilizer in a rice-wheat cropping system. The treatments included 9 combinations of phosphorus application either to both rice and wheat or to rice or wheat alone. Direct application of phosphorus at 13 kg/ha to both the crops resulted in significantly higher total productivity of the rice-wheat cropping system as compared with 26 kg P/ha applied either to rice or wheat alone. Phosphorus at 13 kg/ha for rice and 26 kg/ha for wheat was as efficient as 13 kg P/ha for rice and 13 kg P/ha for wheat. The higher rate of P (26 kg/ha) applied to both rice and wheat resulted a decline in the total productivity. The residual effects of phosphorus applied to either rice or wheat were significant to the succeeding crop but was inferior to its direct application. Phosphorus increased the leaf area index, chlorophyll content of leaves, and interception of more photosynthetically active radiation (PAR) which resulted in increased grain yield of rice and wheat. Phosphorus status of the surface soil declined markedly, in the absence of P application from 15.4 to 6.4 kg P/ha. Phosphorus applied at 26 kg P/ha to both the crops resulted a build up of the available P status of soil. Phosphorus application at 13 kg/ha to both rice and wheat maintained the phosphorus status of the soil at original level.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01055398

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