PRODUÇÃO DE FITOMASSA E TEORES DE MACRONUTRIENTES DA JITIRANA EM DIFERENTES ESTÁGIOS FENÓLOGICOS

Abstract

The green fertilizing has been used to improve the physical-chemical properties of soil, to help the benefic microorganisms, to increase the organic matter and essentially to put the nutrients available to the plants. The objective of this work was to evaluate the production of fitomassa and the macronutrients contents of scarlet starglory in different phonological stages. An experiment was carried out in the agricultural year of 2005, in a completely randomized design with eight treatments and five replications. The treatments consisted of following phenological stages: 15, 30, 45, 60, 75, 90, 105 and 120 days after seed germination of scarlet starglory. Plants of scarlet starglory were taken randomly, with a quadrate of 1.0 m x 1.0 m, and cut at 0.10 m from the soil level. The highest production of fitomass was obtained from 112 days after seed germination of scarlet starglory, with mean weight of fresh mass of 32.69 t ha-1. However, the content of dry matter was 11.07% of the fresh mass at 120 days after germination. The highest contents of N, P and K were obtained of plants with 15 days. Based on these results, it may be possible to use the scarlet starglory as a green fertilizer in the semi-arid condition of Rio Grande do Norte state.