Mandal Asit, Patra Ashok K, Singh Dhyan, Swarup Anand, Ebhin Masto R
Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi 110 012, India.
Bioresour Technol. 2007 Dec;98(18):3585-92. doi: 10.1016/j.biortech.2006.11.027. Epub 2007 Jan 5.
A field experiment was conducted to investigate the effect of six long-term (34-year) fertilizer and farmyard manure (FYM) treatments (Control, N, NP, NPK, NPK+S, NPK+FYM) and three physiological stages of wheat growth on the microbial biomass carbon (MBC), nitrogen (MBN) and dehydrogenase, mineralizable N and phosphatase activities in soil. It was found that a balanced application of NPK+FYM gave the highest values for the measured parameters and lowest at the control. Values were generally highest at tillering, followed by the flowering and dough stages. A significant positive interaction between fertilizer treatments and physiological stages of wheat growth was observed, being highest at maximum tillering due to application of NPK+FYM. Stepwise regressions have revealed that grain yield of wheat was significantly associated with mineralizable N at tillering (R(2)=0.80), MBC at flowering (R(2)=0.90) and alkaline phosphatase activity (R(2)=0.70) at dough stages of wheat growth.
开展了一项田间试验，以研究六种长期（34年）肥料和农家肥（FYM）处理（对照、氮肥、氮磷肥、氮磷钾肥、氮磷钾肥+硫肥、氮磷钾肥+农家肥）以及小麦生长的三个生理阶段对土壤中微生物生物量碳（MBC）、氮（MBN）、脱氢酶、可矿化氮和磷酸酶活性的影响。结果发现，氮磷钾肥+农家肥的平衡施用使所测参数的值最高，而对照处理的值最低。各参数值通常在分蘖期最高，其次是开花期和面团期。观察到肥料处理与小麦生长生理阶段之间存在显著的正相互作用，由于施用氮磷钾肥+农家肥，在最高分蘖期时这种相互作用最为明显。逐步回归分析表明，小麦产量与小麦生长面团期的分蘖期可矿化氮（R² = 0.80）、开花期MBC（R² = 0.90）和碱性磷酸酶活性（R² = 0.70）显著相关。
