Avaliação da adubação orgânica: na cultura do milho (Zea mays L.) e sorgo (Sorghum bicolor (L) Moench) na Região do Cariri Paraibano.

Abstract

The maize crop (Zea mays L.) belongs to the Poaceae family. Sorghum (Sorghum bicolor L. Moench) cultivation encompasses some characteristics that differentiate it from corn crop, high biomass production, rusticity and higher tolerance to water deficit. The objective of this research was to evaluate the development of corn (Zea mays) and sorghum (Sorghum bicolor) forage plants cultivated in the Brazilian semiarid, using different concentrations of cattle manure. The experiment was conducted in the Experimental Area belonging to the CDSA / UFCG - Campus of Sumé - PB, located in the Western Cariri microregion. According to Köppen and Geiger, this climate is classified as BSh. Featuring the geographic coordinates 07° 40' 19’’ South and 36° 52’ 48” West. A randomized complete block design (DBC) was adopted in two crops (maize and sorghum), with four treatments and three replications. The different concentrations of organic fertilization were evaluated, including the manure: Dose 0 kg/m2 (T1); 1.5 kg/m2 (T2); 3.0 kg/m2 (T3); 4.5 kg/m2 (T4), distributed in corn and sorghum crop. The cattle manure provided significant results in the corn crop: number of leaves (10.04 units) and leaf area (FA) 276.27 m2. For sorghum culture a significant result can be noted in the variable plant height (AP) 151.50 cm. Regarding the days of sowing, it was observed that only in the 60 DAS for stem diameter (DC), the corn had a better development (1.85 mm) with sorghum. Moreover, it could be observed that mainly in most of the productivity variables for the two crops, no significant results were influenced by the increasing dosages of cattle manure.