Production of chili pepper under organic fertilization and irrigation with treated wastewater

ABSTRACT With the occurrence of prolonged droughts in the Brazilian semi-arid region, water scarcity directly influences agriculture in this region, so that water reuse and bovine manure application become a viable alternative for pepper production. In this context, the present study aimed to evaluate the sustainable production of chili peppers (Capsicum frutescens) under levels of irrigation with treated wastewater and doses of bovine manure. The following bovine manure doses were considered: D1 (0% manure and 100% soil), D2 (10% manure and 90% soil), D3 (20% manure and 80% soil), D4 (30% manure and 70% soil), D5 (40% manure and 60% soil) and D6 (50% manure and 50% soil), based on volume. Three levels of irrigation were applied, based on the water requirement of the crop (WR), namely: 100% WR (L1), 75% WR (L2) and 50% WR (L3). Production variables and physical characteristics of the produced peppers were evaluated. Pepper production (g plant-1) increased as 10% of bovine manure were added in substrate composition. Increasing concentration of bovine manure and using 50% WR provided favorable conditions for the organic production of chili pepper.

摘要：巴西半干旱地区长期干旱频发，水资源短缺直接影响该区域农业生产，因此污水回用与牛粪施用成为辣椒生产的可行替代方案。在此背景下，本研究旨在评估采用再生灌溉水结合不同牛粪施用量下的辣椒（Capsicum frutescens）可持续生产情况。本研究设置了以下按体积比例配比的牛粪施用量处理：D1（牛粪占比0%、土壤占比100%）、D2（牛粪占比10%、土壤占比90%）、D3（牛粪占比20%、土壤占比80%）、D4（牛粪占比30%、土壤占比70%）、D5（牛粪占比40%、土壤占比60%）以及D6（牛粪占比50%、土壤占比50%）；同时基于作物需水量（water requirement, WR）设置3个灌溉水平处理：100%WR（L1）、75%WR（L2）与50%WR（L3）。本研究对辣椒的产量相关性状与物理品质指标进行了测定。当基质配比中添加10%牛粪时，辣椒单株产量（g·株⁻¹）有所提升；提高牛粪施用量配比并采用50%WR的灌溉水平，可为辣椒有机生产提供有利条件。