Calagem e adubação com potássio, boro e cobre em laranjeira ‘pêra’ em Manaus - AM

Abstract

Brazil is the world's largest producer of orange and juice of orange, contributing to the economy and employment generation in the country. Regarding the state of Amazonas, inadequate technological use, such as liming and fertilizing the soil can limit the actual potential of the culture in the state, in addition to reducing the economic return to the producer. Thus, conducting research is needed that aims to optimize the use of liming and fertilization on citrus in the Amazon. The research objective was to estimate level correction, K, B and Cu for the deployment phase and the formation of orange trees [Citrus sinensis (L.) Osbeck] in the region of Manaus, Amazonas. Four experiments were implanted in design under the field conditions in a randomized block design with four replications. The treatments consisted of five levels liming (0.0, 1.0, 2.0, 3.0 and 4.0 t ha-1), five levels of K2O (0.0, 10.0, 20, 0, 40.0 and 60,0g plant-1), five levels (0.0; 4.4; 8.8; 13.2 and 17.6 g plant-1) and five levels of Cu (0, 0, 0.325, 0.65, 0.975 and 1.3 g plant-1), led by three consecutive years of implementation and formation of the orchard. On the 2nd and 3rd experimental years, we used double and triple the K levels in the 1st year. In relation to B and Cu were utilized 20 and 50% more from the initial level. It was used for planting seedlings of orange trees grafted on lemon rootstock Rangpur [C. limonia (L.) Osbeck]. We evaluated the foliar nutrient concentration and plant height, diameter of the rootstock and graft diameter and canopy volume. It has been found that the correction level did not affect growth of the biometric orange. Regarding the K, was no effect on the biometric parameters, K concentration in the leaf and soil. Furthermore, 9 the levels of B affected plant height and B leaf concentrations. However for Cu levels was observed the effect on plant height and canopy volume, only the third year of assessment