Cultivo do milho híbrido fertilizado com água amarela, manipueira e NPK.

Abstract

The limitation concerning water availability is one of the main factors driving the reduction of agricultural productivity, especially in arid and semi-arid regions around the world. This research aims to evaluate the growth of physiological and hybrid maize production (AG 1051), which was cultivated with treated human urine and cassava wastewater in soil fertilized through basal dressing and fertigation in a safe environment. This experiment was conducted in campus I, at the University of Campina Grande, city of Campina Grande state of Paraiba, Brazil. The treatments consisted of : T1 (NPK - control), T2 (470 mL), T3 (670 mL), T4 (870 mL), T5 (1070 mL), T6 (1270 mL), T7 (1470 mL), all applied through basal dressing, and T8 (F – NPK - control), T9 (F - 470 mL), T10 (F – 670 mL), T11 (F – 870 mL), T12 (F – 1070 mL), T13 (F – 1270) e T14 (F – 1470) applied through top dressing, with an interval of five days, totalizing eight applications. The solution consisted of 51.3 % of cassava wastewater and 48.7 % of human urine. With regard to the growth parameters, organic fertilization applied through fertigation was the one which promoted the absolute growth rate (AGR) and relative growth rate (RGR) in plant height (PH), stem diameter (SD) and number of leaves (NL). The fertilization of T8 was the one which promoted the greatest increase for all variables of production, except for the fresh phytomass of the commercial maize ears with husk having an average weight of 100 dry grains. The application of T11 promoted an increase of 177.82 % for this fresh phytomass. With regard to the chlorophyll A, T12 and T13 with values of 3938.165 μg-1 and 3843.703 μg-1 respectively, for B when fertigated with T14, total chlorophyll value was 5479.152 μg-1 fertilized with T13 and 333440.042 μgg-1 for carotenoids when fertilized with T14. The combination of human urine and cassava wastewater promoted the greatest increments for all the variables evaluated.