ABSTRACT

A study was undertaken to investigate the rate of dissolution of the various Phosphorus (P) sources in an alluvial soil of Bihar under an incubation experiment in the laboratory for 35 days with 5 treatments viz., Control; RP (Rock Phosphate) @ 100% of the RDP (Recommended Dose of Phosphorus); 100% of RDF (Recommended Dose of Fertilizer NPK); REC (Rock phosphate Enriched Compost) @ 100% of the RDP and 50% RDP+REC @ 50% of the RDP. The P release pattern was determined for every treatment at a sampling interval of 7 days. The integrated treatment involving REC and P-fertilizer (50:50) performed better than other treatments. This combination released greater labile P (16.14 mgkg⁻¹), Fe-Al-bound P (74.48 mgkg⁻¹), and Ca bound P (147.04 mgkg⁻¹) in soil. It could be concluded that enriched compost (50%) along with the reduced application (50%) of inorganic P fertilizer could be very helpful in supplementing the P requirement of plants by increasing its release and availability under naturally P deficient conditions.

摘要

在实验室进行了为期5天的35天孵育实验后，进行了一项研究以调查各种磷（P）源在比哈尔邦冲积土壤中的溶解速率，即5种处理方法，即对照。RP（磷酸盐）@ RDP（推荐的磷剂量）的100％；100％的RDF（NPK推荐剂量）；REC（富含磷酸岩石的堆肥）@ RDP的100％，RDP + REC 50％的RDP的50％。在7天的采样间隔内确定每种处理的P释放模式。涉及REC和P肥（50:50）的综合处理效果优于其他处理。这种组合释放出更高的不稳定P（16.14 mgkg ^-1），Fe-Al结合的P（74.48 mgkg ^-1）和Ca结合的P（147.04 mgkg ^-1））在土壤中。可以得出结论，通过增加自然磷缺乏条件下植物的磷释放量和利用率，丰富的堆肥（50％）以及减少的无机磷肥料施用量（50％）可能对补充植物对磷的需求非常有帮助。