Department of Soil Science, Punjab Agricultural UniversityLudhiana-141 004, Punjab, India
*Corresponding Author: R. Sikka, Department of Soil Science, Punjab Agricultural University, Ludhiana-141 004, Punjab, India, Email: sikkar@pau.edu
Online Published on 15 July, 2022.
Soybean-wheat is the most dominant soybean based cropping system and it also fits well in soybean-spring maize and soybean-gobhi sarson cropping systems. Soybean being a highly nutrient-exhaustive crop requires higher amounts of nutrients, particularly phosphorus for its optimum production. Thus, the present investigation was undertaken.
A field experiment was conducted for three years to study the effect of phosphorous application on yield and P uptake by soybean in different cropping systems. There were three cropping systems which were kept in main plots and five P levels viz., 0, 20, 40, 60 and 80 kg P2O5 ha−1 applied to soybean which were kept in the sub plot.
Application of 80 kg P2O5 ha−1 resulted in highest mean seed yield of soybean (20.9 q ha−1) but significant response was observed up to 40 kg P2O5 ha−1 (19.8 q ha−1) only. Highest mean seed P uptake of soybean was observed under application of 80 kg P2O5 ha−1. The mean seed yield, stover yield and P uptake of soybean was not affected significantly under different cropping systems. The interaction effects of cropping system and applied P levels were however non-significant. A significant build-up of available P in surface soil over control was observed under 80 kg P2O5 ha−1 level.
Available P, Cropping systems, P uptake, Phosphorous, Soybean, Yield
