Desenvolvimento inicial e eficiência nutricional de Campomanesia adamantium no uso de nitrogênio e fósforo

Abstract

The Campomanesia adamantium (guavira, Myrtaceae) is a native shrub that has food, medicinal use and as bee pasture. The leaves and fruit have substances used as anti- inflammatory, antiseptic and antidiarrheal urinary tract. The fruits are used in nature in the form of juices, jellies, jams, ice creams, puddings, and buckler for making homemade liqueurs, being intensively harvested for extraction, without the worry of maintaining the plants. Nevertheless, there are few studies reporting the agronomic aspects of this species, especially nutritional. Thus, the objective was to study the early development and nutritional efficiency of C. adamantium grown with nitrogen and phosphorus in Oxisol. Two works, the first being studied initial growth and, second, the nutritional efficiency of the plant, both using the interaction of four levels of N (0; 20.82; 41.64 e 62.46 mg kg-1 de N) and four levels of P2O5 (0; 41.72; 83.44 e 125.16 mg kg-1 de P2O5) and two crops [100 and 200 days after transplanting (DAT)]. In the first study, it was noticeable that fertilization with nitrogen and phosphorus at doses of 62.46 mg kg-1 of N and 82.95 mg kg-1 P2O5, were sufficient to promote higher initial development of the species, to 200 DAT. Then, it was observed that C. adamantium showed greater demand for N and P2O5, up to 100 DAT, and over time there was reduction requirement of P2O5 from 76 mg kg-1. There dilution levels of macronutrients and micronutrients increased levels over time, from 100 to 200 DAT. The order of nutrient accumulation to 100 DAT was N>Ca>K>Mg>P>Fe>Mn>Zn>Cu and 200 DAT was N>Ca>K>P>Mg>Fe>Mn>Cu>Zn, while the order of efficiency of use for the two crops was P>Cu>Mg>K>Ca>Zn>N>Mn>Fe.