GROWTH ANDYIELDOFSEMI-HYDROPONIC BELL PEPPER UNDERDESALINATION WASTE-WATER AND ORGANIC AND MINERALFERTILIZATION

ABSTRACT In a scenario of water scarcity in semiarid regions, it is imperative to design food production systems that use different sources of water. The waste of desaltersis a potential source, especially when combined with the hydroponics technique that includes the supply of nutrient solution as a source of water and nutrients. In addition, other techniques such as enhanced organic matter with biofertilizer can complement this low-quality water use strategy. Thus, the aim of this study was to analyze the possible dampening effect of biofertilizers in the open system of hydroponic culture of pepper owing to the increase in water salinity. The study was conducted at the Teaching Unit, Research and Extension, Federal Institute of Education, Science and Technology of Ceará, Limoeiro do Norte Campus. The experimental design was a factorial 5 × 4 randomized block for five saline water concentration sand three doses of biofertilizers and one control with mineral fertilizer, and four replicates totaling 80 experimental units with 3 plants per plot. The variables analyzed were number of fruits per plant, production, and length and width of the fruit. All production variables declined linearly with increasing salinity. In addition, the biofertilizer did not attenuate the deleterious effects of salinity as shown by the productivity data. The fertilization with mineral fertilizers produced greater yields, followed by application of 50%, 100%, and 150% of the biofertilizer dose.

摘要：在半干旱地区水资源短缺的背景下，设计可利用不同水源的粮食生产系统势在必行。脱盐装置的废水是潜在水源之一，尤其可与以营养液作为水分与养分供应源的水培（hydroponics）技术结合使用。此外，施用生物肥料（biofertilizer）强化有机质的相关技术可对该低质水源的利用策略形成补充。据此，本研究旨在分析生物肥料对辣椒开放式水培系统中，因水盐度升高所产生的缓冲效应。本试验于塞阿拉联邦教育科学技术研究院北利梅鲁校区教学、研究与推广单元开展。试验采用5×4因子随机区组设计，设置5个盐水浓度梯度、3个生物肥料施用量梯度及1个无机肥（mineral fertilizer）对照组，共4次重复，总计80个试验单元，每小区种植3株植株。本研究测定的指标包括单株果实数、产量及果实长宽。所有产量相关指标均随盐度升高呈线性下降趋势。此外，产量数据表明，生物肥料未能缓解盐度带来的有害影响。无机肥处理的产量最高，其后依次为50%、100%及150%生物肥料施用量处理组。