An Asian Journal of Soil Science

H. P. Verma ¹, P. K. Chovatia ², R. C. Sanwal ³

Affiliations
1 Department of Agronomy, S.K.N. Agriculture University, Jobner (Rajasthan), IN
2 Department of Agronomy, College of Agriculture, Junagadh Agricultural University, Junagadh (Gujarat), IN
3 Department of Soil Science, Swami Keshwanand Rajasthan Agricultural University, Bikaner (Rajasthan), IN

Abstract

A field experiment was conducted during summer season of 2012 on medium black soil to the study of effect of nitrogen and phosphorus levels on uptake by cowpea (Vigna unguiculata (L.) Walp) and residual N, P and K content in soil. The experiment consisted of four treatments of nitrogen levels (control, 20, 30 and 40 kg/ha) and four treatments of phosphorus levels (control, 40 60 and 80 kg P₂O₅/ha) thereby making sixteen treatment combinations tested in Factorial Randomized Block Design with three replications. The results indicated that the application of nitrogen @ 40 kg/ha gave the maximum and significantly higher the N, P and K uptake and residual content in soil and remained at par with 20 and 30 kg N/ha over control. Results further indicated that the application of phosphorus @ 80 kg/ha gave the maximum and significantly higher the N, P and K uptake and residual content in soil and remained at par with 40 and 60 kg P₂O₅/ha over control.

Keywords

Cowpea, Nitrogen, Phosphorus, Potassium, Uptake.

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M. S. Dudhat ¹, P. K. Chovatia ², B. T. Sheta ³, H. D. Rank ¹, H. V. Parmar ¹

Affiliations
1 Department of Soil and Water Engineering, College of Agricultural Engineering and Technology, Junagadh Agricultural University, Junagadh (Gujarat), IN
2 Department of Agronomy, Junagadh Agricultural University, Junagadh (Gujarat), IN
3 DWRS, B.A. College of Agriculture, Anand Agricultural University, Anand (Gujarat), IN

Abstract

An experiment was conducted to study the effect of nitrogen, phosphorous and potash on growth and bulb yield of onion during the Kharif season of the years 2003-04, 2004-05 and 2005-06. There were significant effects of nitrogen and phosphorous on bulb yield. Among the different nitrogen levels, application of 100 kg N ha^-1 produced significantly the highest bulb yield of 679.04, 484.28 q ha^-1 during the year 2003-04 and 2004-05, respectively with pooled mean of 544.70 q ha^-1. However, statistically it was par with the application of 75 kg N ha^-1 during the year 2003-04, 2004-05 and in pooled. Application of 50 kg P₂O₅ ha^-1 recorded significantly the highest bulb yield of 671.26, 476.03 q ha^-1 during the year 2003-04 and 2004-05, respectively with pooled mean of 536.76 q ha^-1.Though, application of potash @ 50 kg ha^-1 produced higher bulb yield during all the individual years and in pooled mean, but its effect was non significant. The results also revealed that increasing levels of nitrogen, phosphorus and potash, progressively increased the growth and yield attributes. With regards to economics, the maximum net returns of 70485, 68997 and 66278 Rs. ha^-1 and benefit cost ratio of Rs. 1.83, 1.80 and 1.76 were recorded with the application of 100 kg N ha^-1, 50 kg P₂O₅ ha^-1 and 50 kg K₂O ha^-1, respectively.

Keywords

N, P, K, Bulb Yield, Economics, Onion.

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