Effect of Phosphorus and Calcium Availability as Influenced by Manure, Rock Phosphate, and Dolomite on Soybean Yield

Abstract Soybean (Glycine max) contains nutritional components such as high protein which support health needs and improve the quality of life. However, to achieve this standard, soybean productivity needs to be increased. Manure, rock phosphate, and dolomite are potential alternatives in improving soybean production. This study aims to examine phosphorus and calcium availability as Influenced by manure, rock phosphate, and dolomite to increase soybean yield. The experiment consisted of six treatments groups with four replications using a completely randomized block design. Furthermore, the groups include T0 (Control), T1 (5 t ha− 1 manure + 2.5 t ha−1 rock phosphate), T2 (5 t ha−1 manure + 5 t ha−1 rock phosphate), T3 (5 t ha− 1 + 2.5 t ha−1 dolomite), T4 (5 t ha−1 manure + 5 t ha−1 dolomite), and T5 (5 t ha−1 manure + 5 t ha− 1 rock phosphate + 5 t ha−1 dolomite). The results showed that phosphorus and calcium availability were significantly influenced by manure, rock phosphate, dolomite, and simultaneously increase soybean yield. Also, the best number of filled pods, 100-seed weight and yield were obtained with the application of 5 t ha−1 manure + 5 t ha−1 rock phosphate + 5 t ha−1 dolomite (20 pods plot−1, 0.62 g, and 260.89 g plot−1 respectively). Therefore, based on the results, phosphorus and calcium obtained from manure, rock phosphate and dolomite potentially increase soybean yield.