Phosphate fertilization with organomineral fertilizer on corn crops on a Rhodic Khandiudox with a high phosphorus contente

Abstract: The objective of this work was to evaluate the nutritional content and grain yield of three corn (Zea mays) crops in response to phosphate fertilization with an organomineral fertilizer based on poultry litter or a mineral fertilizer, when cultivated on a Rhodic Khandiudox with a high initial phosphorus content. The experiment was carried out in the field in a randomized complete block design in a 2×4+1 factorial arrangement (organomineral or mineral fertilizer × 20, 40, 60, or 80 kg ha-1 P + control treatment with no phosphate fertilization), with four replicates each. Available P and total organic carbon (TOC) contents in the soil at the end of the crop cycle, plant tissue P contents, and grain yield were determined. The agronomic efficiency index (AEI) was estimated based on corn grain yield. After three harvests, soil available P and TOC contents did not increase significantly due to fertilizer use, but were directly related to P doses. In a Rhodic Khandiudox with a high initial P content, the use of an organomineral fertilizer based on poultry litter promotes higher corn crop yield, with an AEI 20% higher than that of the mineral fertilizer.

摘要：本研究旨在探究种植于初始磷含量较高的Rhodic Khandiudox土壤上的3季玉米（Zea mays），在施用基于家禽垫料制备的有机无机复合肥或矿物磷肥时的营养品质与籽粒产量表现。实验采用随机完全区组设计，设置2×4+1析因处理组合：肥料类型（有机无机肥、矿物肥）×磷素施用量（20、40、60、80 kg·ha⁻¹），外加无磷肥施用的对照处理，每组设置4次重复。测定指标包括作物生育周期结束后的土壤有效磷与总有机碳（TOC）含量、植株组织磷含量及籽粒产量，并基于玉米籽粒产量估算农学效率指数（AEI）。经过三次收获后，施肥并未显著提升土壤有效磷与总有机碳含量，但二者与磷素施用量呈直接相关关系。在初始磷含量较高的Rhodic Khandiudox土壤中，施用基于家禽垫料的有机无机复合肥可获得更高的玉米籽粒产量，其农学效率指数较矿物肥料高出20%。