Deshbhratar P B, Singh P K, Jambhulkar A P, Ramteke D S
Environmental Impact and Risk Assessment Division, National Environmental Engineering Research Institute (NEERI), Nehru Marg, Nagpur--440 020, India.
J Environ Biol. 2010 Nov;31(6):933-7.
A field experiment was conducted to study the impact of Sulphur(S) and Phosphorus (P) on yield, nutrient status of soil and their contents in pigeonpea (Cajanus cajan) during the year 2008-2009. Seven treatments were studied in Factorial Randomized Block Design with three replications. The treatment combinations were derived from three levels of sulphur (0, 20 and 40 kg S ha(-1)) and four levels of phosphorus (0, 25, 50 and 75 kg ha(-1)). The experimental soil was medium black, slightly calcareous, clay in texture and slightly alkaline in reaction. The results indicated a significant increase in grain yield (14.81 q ha(-1)) and straw yield (41.26 q ha(-1)) of pigeonpea after 20 kg S ha(-1) and 50 kg P2O5 ha(-1) treatment with common dose of nitrogen @ 30 kg ha(-1). The increase in grain and straw yield was 102.77 and 52.87% as compare to higher over control. Maximum number of pods plant(-1), maximum number of grains pod and test weight by this treatment was also observed as compared to control. Application of S and P improved soil fertility status and S alone did not influence P availability. Hence, in order to maintain the fertility status of the soil at high level, combine application of 20 kg S ha(-1) with 50 kg P2O5 ha(-1) is essential. The residual fertility status of soil is advocated for rainfed pigeonpea crop grown on vertisol in Vidarbha region.
2008 - 2009年期间，进行了一项田间试验，以研究硫（S）和磷（P）对木豆（Cajanus cajan）产量、土壤养分状况及其含量的影响。采用析因随机区组设计研究了7种处理，重复3次。处理组合来自三个硫水平（0、20和40 kg S ha⁻¹）和四个磷水平（0、25、50和75 kg ha⁻¹）。试验土壤为中等黑色，微钙质，质地为粘土，反应呈微碱性。结果表明，在施氮量为30 kg ha⁻¹的常规用量下，20 kg S ha⁻¹和50 kg P₂O₅ ha⁻¹处理后，木豆的籽粒产量（14.81 q ha⁻¹）和秸秆产量（41.26 q ha⁻¹）显著增加。与对照相比，籽粒和秸秆产量分别增加了102.77%和52.87%。与对照相比，该处理还观察到单株荚果数最多、每荚粒数最多和千粒重最大。硫和磷的施用改善了土壤肥力状况，单独施用硫不影响磷的有效性。因此，为了将土壤肥力维持在较高水平，必须将20 kg S ha⁻¹与50 kg P₂O₅ ha⁻¹混合施用。对于在维达巴地区变性土上种植的雨养木豆作物，提倡保持土壤的残留肥力状况。
