Đang chuẩn bị liên kết để tải về tài liệu:
Soil test crop response based fertilizer equations for Bt cotton under rainfed situation in Vertisol

Field experiments were conducted on a Typic Haplustert of Tamil Nadu by adopting the inductive cum targeted yield model developed for Bt cotton under rainfed situation. The basic parameters viz., NR, Cs, Cf and contribution of nutrients from FYM were computed from the field experimental data developed in the previous cropping season. Using these basic parameters, fertilizer prescription equations were developed under the Integrated Plant Nutrition System (IPNS) and nomograms were formulated for the desired yield target of Bt cotton for a range of soil test values. The quantity of nutrients that could be contributed by FYM at 12.5 t ha-1 was evaluated as 25, 20 and 26 kg N, P2O5 and potassium oxide K2O respectively, when applied along with the NPK fertilizers as per soil test and desired yield target. The fertilizer prescription equations developed for Bt cotton proved their validity under six numbers of farmer’s holdings under rainfed situation. | Soil test crop response based fertilizer equations for Bt cotton under rainfed situation in Vertisol