Banca de DEFESA: JÂNIO PEDRO DA SILVA VIEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JÂNIO PEDRO DA SILVA VIEIRA
DATE: 27/09/2021
TIME: 14:00
LOCAL: Arapiraca
TITLE:

BIOMASS, DECOMPOSITION AND NUTRIENT RELEASE OF SHOOT COVER CROPS IN THE AGRESTE REGION, ALAGOAS, BRAZIL

KEY WORDS:

green manure, nutrient cycling, crop rotation.

PAGES: 62
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Fertilidade do Solo e Adubação
SUMMARY:

Green manure consists in the cultivation of different plant species in the same area, in succession or simultaneously, with the main purpose of improving soil fertility. Thus, it is preferred that those that produce a greater volume of dry matter, are less subject to pests and diseases and that have relatively uniform and easy to sow seeds. The Fabaceae family plants are the most used in green manure, due to their high potential to carry out the fixation of atmospheric nitrogen through symbiosis with bacteria present in nodules located in plant roots, and their growing capacity to store biomass and nutrients, characterizing itself as one of the most suitable methods for use in agriculture. The aim of the present study was to evaluate biomass production, decomposition rates and nutrient release dynamics from the aboveground part of cover crops in the Agreste region, Alagoas, Brazil. The experiment was carried out under field conditions, in the experimental area of the Federal University of Alagoas - Campus Arapiraca, in randomized blocks, with four replications. The treatments consisted of cover crops: sunn hemp (Crotalaria juncea), Spectabilis (Crotalaria spectabilis), dwarf pigeon pea (Cajanus cajan), lablab (Dolichos lablab), jack bean (Canavalia ensiformis), millet (Pennisetum glaucum) and black velvet bean (Mucuna aterrima). The decomposition and release of nutrients from the residues was monitored through periodic collections at 30, 60, 90, 120 and 150 days after the incorporation of litter bags in the soil containing 20 grams of dry mass. Biomass production, extraction and nutrient use efficiency, and the decomposition and release of nutrients from waste were evaluated. The studied variables show significant differences in relation to nutrient concentrations, C/N and C/P ratio in dry mass, yield, extraction and nutrient use efficiency by the aerial part of cover crops in full bloom. Decomposition rates and half-life times varied with the cover crop species, with jack bean being the species with the highest rates and half-life times.

BANKING MEMBERS:
Presidente - 2626313 - VALDEVAN ROSENDO DOS SANTOS
Externo ao Programa - 1120948 - GILSON MOURA FILHO
Externo à Instituição - RUBENS PESSOA DE BARROS - UNEAL