Critical level of phosphorus for shallot on soils of Brebes Regency, Central Java, Indonesia
2023
Hartono, A. | Nadalia, D. | Sulistiono, M.R.F.
Intensification of balanced fertilization is one way to improve shallot quality and production to meet market demand. In order to achieve optimal crop yields, soil phosphorus (P) availability must be above a critical level. This study aimed to determine the critical level of P in Brebes soils for shallots, determine the best extractant for shallots and evaluate the effect of P fertilisation on plant growth and production. Determination of the critical level of P in the soil was determined by extracting soil P from 16 locations spread across Brebes Regency. P fertilisation was carried out by applying KH2PO4 solution as much as 0, X, X, and 2X where X is the recommended dose of P fertilizer in the form of P205 of 120 kg/ha. The plants were harvested after six weeks after planting. The critical level of soil P is determined using the Cate and Nelson method. The results showed that each P extraction had different correlation coefficient values influenced by the type of extractants. The correlation coefficients between soil P nutrient content extracted by Bray 1, Olsen, Mehlich 1, and HCl 25% methods and plant dry weight were 0.630, 0.341, 0.821, and -0.089, respectively. The correlation values for Bray 1 and Mehlich 1 methods with plant dry weight were statistically significant and highly significant, respectively. The critical level of soil P content to achieve 90% of relative yield of shallots in Brebes based on Bray 1, and Mehlich 1 methods were 40 ppm P. The results recommended that the soil P extractor in Brebes was Mehlich 1. Fertilization was recommended on soils with soil P content less or equal to 40 ppm P.
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