Resposta da mamona irrigada com esgoto sanitário tratado e poço freático às aplicações de zinco e boro em condições de baixa altitude

Abstract

Mamona´s culture (Ricinus communis L.) could be one option to the irrigation areas from brazilian Northeast, specially in the case of water reuse and industrial exploration to biodiesel production, it does not mean feeding problems, but without loosing the standards Organização Mundial de Saúde (World Health Organization) and Vigilância Sanitária (Health Measures). Due to the importance of agriculture fertilizers, just like the production cost, its important the characteristic assessment and the responsible factors from this products. The zinc and boron are micronutrients that, with frequency, are not efficient to brazilian soil. The objective of this essay is evaluate the effect of zinc and boron micronutrients in mamona´s plant, product IAC Guarani, irrigate with treated drain water and water well with productivity and production components. The experiment was conducted by Water Researchment Center, from Companhia de Águas e Esgotos (Water and Drain) from Ceará (CAGECE), from the city of Aquiraz, metropolitan region from Fortaleza, altitude 14,2m localization South latitude 38° 23`28`` Greenwich longitude. The research was realized in two experiments, with four repetitions, factorial diagram 2x3 with two types of water (well water and treated drain water) and three levels of zinc and boron. Mamona´s cultivate from the experiments was IAC Guarani, from Instituto Agrônomo (Agronomic Institute) from Campinas (IAC). With the results from the research we could conclude that the stalk did not suffer any influence from the type of water used. The height of the first plant that we used zinc suffered difference according to the water, being bigger with treated drain water. The heights with the use of boron reduce the third plants. With the application of 6,6 kg boron and the use of treated drain water we could see a better development from the number of fruits in the second plants. With the application of boron with drain water we could see a reduction in the médium length from third plants, affecting the production. When is used the treated drain water the number of fruits from the third plants increased 48%. The experiment with boron showed statistics differences with the fruits weight from the third plants according to the water, being bigger the fruits that was used the treated drain water. The seed medium weight was approximate 42% higher with the use of treated drain water. The productivity with treated drain water was 161 kg.ha-1 more than the use of common well water. The potential productivity found from both experiments was: 1.485,00 kg.ha-1 with zinc and 1.509,00 with boron, without significant statistical difference about the use of water.