ABSTRACT

The association of mineral and organic fertilization is a nitrogen supply system for the melon crop. Nitrogen (N) fractionation is an important tool to understand its dynamics in the soil and the contribution of each fraction to N bioavailability. This study aimed to evaluate the effects of organic and mineral fertilization on organic and inorganic forms of soil N of the cultivation of yellow melon. The experiment was conducted in the Experimental Field of Pacajus, belonging to Embrapa Agroindústria Tropical, in soil classified as Red Yellow Argisol. The experimental design was a split-plot randomized block. Fertilizer application was the main plot treatment and sampling time was arranged as subplots. The experimental results indicated that only organic fertilization was sufficient to significantly increase the total-N content (varying from 1,127 mg kg⁻¹ to 967 mg kg⁻¹) compared to only mineral fertilization (951 mg kg⁻¹) and organic N represented 92 ± 2% of the total-N. In addition, the higher hydrolyzable N content was observed in the treatment with only bovine manure application (542 mg kg⁻¹) which represents an N source for the mineralization and subsequent inorganic N for plants. Our results reveal that organic fertilization is efficient for long-term fertility management, increasing melon productivity.

摘要

矿物和有机肥的结合是瓜类作物的氮供应系统。氮 (N) 分馏是了解其在土壤中的动态以及每个部分对 N 生物有效性的贡献的重要工具。本研究旨在评估有机肥和矿物肥对黄瓜栽培土壤氮有机和无机形态的影响。该实验在属于 Embrapa Agroindústria Tropical 的 Pacajus 实验田中进行，土壤分类为红黄色 Argisol。实验设计是一个裂区随机区组。施肥是主要的小区处理，采样时间安排为子小区。实验结果表明，仅有机肥就足以显着提高全氮含量（从 1、^-1至 967 mg kg ^-1 ) 与仅矿物施肥 (951 mg kg ^-1 ) 相比，有机氮占总氮的 92 ± 2%。此外，在仅施用牛粪（542 mg kg ^-1）的处理中观察到较高的可水解氮含量，牛粪是矿化的氮源和随后植物的无机氮源。我们的研究结果表明，有机施肥对于长期的生育管理是有效的，可以提高甜瓜的生产力。