Effect of fertigation of primary treated biomethanated spentwash along with nitrogen levels on soil micronutrient, heavy metal status, uptake, economics and yield of soybean (Glycine max)-wheat (Triticum aestivum) cropping sequence on Inceptisol

摘要

The field experiment was carried out during the third (2009-10) and fourth years (2010-11), which was initiated in 2007-08 at Rahuri, to study the effect of fertigation of primary treated biomethanated spentwash (PBSW) on mi-cronutrient, heavy metal status of soil and uptake of soybean [Glycine max (L.) Merr.] and wheat [Triticum aestivum (L.) emend. Fiori & Paol.], when grown in a sequence. The treatments comprised recommended dose (RD)-NPK, 100% RD of nitrogen (N) through PBSW with and without phosphorus (P) mineral fertilizer, 25 and 50% RD of N through PBSW + remaining N and P through mineral fertilizers. The application of 25% recommended dose of N through PBSW + remaining N and P through mineral fertilizers increased the total Fe, Zn, Mn and Cu uptake by soybean and wheat, soybean-grain equivalent yield of wheat and benefit: cost ratio compared to 100 and 50% RD-N through PBSW treatments and improved the status DTPA-Fe, Zn, Mn, Cu, Ni, Cd and Pb as compared to RD-NPK at all 3 soil depths. However, heavy metal status values were below the permissible limits. Fertigation of 25% N-PBSW along with mineral fertilizers not only help in improvement of the micronutrient status of soil but also prevent any adverse effect on soil health.