Author(s):

Pankaj Singh, Sanjay Tiwari, Sanjay Kr Singh and Rajesh Kr Pal

Abstract: To overcome the bottleneck of conventional blanket fertilizer recommendation there is need of site specific knowledge of crop nutrient requirements, indigenous nutrient supply, and recovery efficiency of applied fertilizer which emphasizes ‘feeding’ rice with nutrients as and when needed so as to enable the farmers to fill up the gap between the nutrient needs of a high yielding crop and the nutrient supply occurring from indigenous sources such as crop residue and manures. The SSNM approach was evaluated during kharif 2017 at RPCAU, Pusa, Bihar with Nutrient Expert (NE) software, a computer based decision tool for rapidly providing recommendation to farmers in presence or absence of soil testing data. The treatments were replicated thrice and arranged in randomized block design. The treatments included - Recommended fertilizer dose (T1); SSNM based on nutrient expert (T2); SSNM based on LCC/Green Seeker (50% Nitrogen as basal and rest 50% based on LCC or Green Seeker(T3); T2 minus N (T4); T2 minus P (T5); T2 minus K (T6) and Absolute control without NPK (T7). The experimental soil was calcareous in nature with pH - 8.4, organic carbon - 0.6%, available N- 192.5 kg ha^-1, available-P₂O₅ 31.2 kg ha^-1, available- K₂O 202.8 kg ha^-1 and DTPA- Zn 0.41 mgkg^-1. The results indicated that, nutrient expert treatment recorded significantly higher grain yields (5.3 t ha^-1) as compared to recommended fertilizer (4.9 t ha^-1). The panicles m^-2 and 000’grain weight were significant and both, nutrient expert and agronomic recommendation were at par to each other. Significantly higher nutrient uptake was recorded under nutrient expert and similarly, the availability of nitrogen and potassium in post-harvest soil was significantly higher under nutrient expert as compared to all other treatments. Therefore, fertilizer recommendations based on soil supply potentials <em>i.e., </em>site specific nutrient management (SSNM) through the use of nutrient expert helped in realizing better yields.

Pages: 399-401  |  1293 Views  290 Downloads

Download (474KB)