Effect of qualities of irrigation water and nitrogen phosphorus and potassium fertilizers on grain and straw yield of wheat
Lal, R.; Lal, P.
Anales de Edafologia y Agrobiologia 48(5-12): 919-928
In a two year field experiment conducted in a split plot design on same piece of loamy sand soil with similar layout, wheat (Triticum aestivum L.) variety Kalyan Sona was tested to determine its yield potential with the application of three levels of nitrogen viz. 120, 150 and 180 kg N/ha; two levels of phosphorus viz, 30 and 45 kg P2O5/ha and two levels of potassium viz. 20 and 30 kg K2O/ha under irrigation with five types of water viz. EC 0.90 dS/m and SAR 3.67 (control water), EC 4.0 dS/m and SAR 16 (E1S1) EC 4.0 dS/m and SAR 26 (E1S2), EC 8.0 dS/m and SAR 16 (E2S1) and EC 8.0 dS/m and SAR 26 (E2S2). Although the grain and straw yield decreased at higher levels of EC and SAR of irrigation water as compared to their corresponding lower levels, the extent of reduction was more conspicuous at higher level of salinity than at higher level of sodicity of irrigation of wheat crop without much reduction in yield. The NPK fertilization improved the yields at every level of EC and SAR of irrigation water but the response decrease at higher level of EC and SAR of irrigation water. Additional application of nitrogen, phosphorus and potassium mitigated the adverse effect of poor quality water of grain and straw yield of wheat.