Evaluation of calcium absorption by 'yellow' melon with green manure use in the Brazilian Semiarid.

The objective was to evaluate the absorption curve and the calcium contribution by green manure in the development of yellow melon produced in the Brazilian Semiarid region

Green manure contributing for nutrients cycling in irrigated environments of the Brazilian Semi-Arid.

This study aimed to evaluate the dry matter production and accumulation of nutrients of the aerial phytomass of two types of plant mixtures and the spontaneous vegetation kept between the lines of a mango orchard, under two systems of soil managemen

Efeito de diferentes tipos de cobertura do solo sobre propágulos de fungos micorrizicos arbusculares.

O uso de coquetéis vegetais pode beneficiar o sistema solo-planta por aumentar os teores de matéria orgânica e a atividade microbiana. Foi realizado um experimento com objetivo de avaliar o grau de colonização radicular por fungos micorrízicos arbusculares (FMA) dos coquetéis vegetais. O experimento foi conduzido em Petrolina-PE, em um Argissolo com nível alto de P (> 23 mg/dm3), sem adição de fertilizantes e com irrigação. O delineamento experimental foi o de blocos ao acaso, com três tratamentos de cobertura vegetal e três repetições. Os tratamentos foram: T1 ? coquetel vegetal 1, T2 ? coquetel vegetal 2 e T3 ? vegetação espontânea. As espécies de planta utilizadas na cobertura do solo como coquetéis vegetais ou que cresceram como vegetação espontânea apresentaram colonização radicular variando de 55 a 92%. A cobertura do solo com coquetéis vegetais ou pela vegetação espontânea podem promover o aumento da infectividade micorrízica do solo

Nitrate in soil solution with use of plant cocktails as green manure in diferent tillage systems in the brazilian semi-arid

Tillage systems strongly affect nutrient transformations and plant availability. The objective of this study was to assess the nitrate dynamic in soil solution in different tillage systems with use of plant cocktail as green manure in fertilized melon (Cucumis melon) in Brazilian semi-arid. The treatments were arranged in four blocks in a split-plot design and included three types of cover crops and two tillage systems, conventional tillage (CT) and no-till (NT). The data showed no strong effect of plant cocktails composition on NO3-N dynamic in the soil. Mean concentration of NO3-N ranged from 19.45 mg L-1 at 15 cm to 60.16 mg L-1 at 50 cm soil depth, indicating high leachability. No significant differences were observed between NT and CT treatments for 15 cm depth. The high soil moisture content at ~ 30 cm depth concentrated high NO3-N in all treatments, mean of 54.27 mg L-1 to NT and 54.62 mg L-1 to CT. The highest NO3-N concentration was observed at 50 cm depth in TC (60.16 mg L-1). High concentration of NO3-N in CT may be attributed to increase in decomposition of soil organic matter and crop residues incorporated into the soil

Cover crop cocktails as N and P source in the Brazilian Semiarid.

The objective was to evaluate the availability of N and P by plant cocktails used as cover crop and green manure in the semiarid