用污水处理后的废水施肥briachiaria brizantha的生产力和养分提取

G. O. Santos, R. T. Faria, Gárdia Rodrigues, G. D. F. Dantas, N. R. Costa
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引用次数: 3

摘要

本研究评估了2013 - 2014年巴西圣保罗Jaboticabal处理过的污水(TSE)对Brachiaria brizantha ' Marandu干生物量生产力和养分提取的响应。采用三线源喷灌系统,在5个处理中均匀渐进地灌溉TSE和矿物施肥,水中TSE含量为1.0 (E5);0.87 (E4);0.6 (E3);0.31 (E2), 0.11 (E1)。除施肥外,所有处理均辅以磷和钾。2013年和2014年分别在1853和2253 mm的深度施用TSE。这为E5提供了如下的N、P、K、Na (kg hm -1): 2013年为931、27、314和894,2014年为1132、21、463和1428。高剂量的TSE对棘豆干生物量产量和养分提取的影响最为显著。大量营养元素的提取以K和N较高,其次是K、Ca、Mg和Na。基于不污染土壤的TSE施肥对作物生产力和土壤养分提取的响应,我们建议进一步研究增加施肥量。
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Productivity and nutrient extraction by Brachiaria brizantha fertigated with treated sewage effluent
The present study was performed to evaluate the responses in productivity and nutrient extraction in dry biomass of Brachiaria brizantha ‘Marandu’ fertigated with treated sewage effluent (TSE) from 2013 to 2014, in Jaboticabal, São Paulo, Brazil. A triple line source sprinkler system was used to perform uniform but gradual irrigation of TSE and mineral fertilization in five treatments, with the following TSE fractions in water: 1.0 (E5); 0.87 (E4); 0.6 (E3); 0.31 (E2), and 0.11 (E1). In addition to fertigation, all treatments were supplemented with P and K. TSE was applied at depths of 1,853 and 2,253 mm year-1 in 2013 and 2014, respectively. This provided E5 with the following amounts of N, P, K, and Na (kg ha-1): 931, 27, 314, and 894, in 2013, and 1,132, 21, 463, and 1,428, in 2014. The most relevant effects on B. brizantha dry biomass yield and nutrient extraction were obtained with higher doses of TSE. The extract of macronutrients was higher for K and N, followed by K, Ca, Mg, and Na. Based on the responses in productivity and nutrient extraction of soil by the crop as a function of TSE fertilization without soil contamination, we propose that increased fertilizer application be studied further.
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