Cálcio e boro para soja-perene: características anatômicas e agronômicas e concentração de nutrientes / Calcium and boron for perennial soybean: anatomical and agronomic characteristics and nutrient concentrations

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Forage legumes have been mixed with grasses and contributed to improve the sustainability of the soil- plant- animal system. Perennnial soybean (Neonotonia wightii) is one forage legume well adapted to the tropical areas. Calcium and boron have resulted in benefits for plant development, particularly in legume species. This study was set with the objectives of verifying the effects of calcium and boron combinations for perennial soybean in plant morphophysiology, production, mineral concentrations, carbohydrate concentrations in cell wall, anatomical changes in leaf tissues and visual symptoms. A greenhouse experiment was carried out with plants grown in plastic pots containing ground quartz and supplied with nutrient solutions. An incomplete factorial 5 x 5, with 13 combinations of calcium and boron rates, was set in randomized block design. Plants were harvested twice, the first harvest one at 46 days after seedlings transplanting to the pots and the second harvest at 38 days after the first one. The upper part (three completely expended leaves) was separated from the lower part of plant tops and roots that were collected too. Calcium x boron interaction was only significant for the calcium concentration in the lower part of perennial soybean. Calcium rates changed leaf area, concentrations of calcium, magnesium and potassium in the sampled plant tissues, and carbohydrate concentrations in the cell wall of perennial soybean. Boron rates influenced changes in roots (dry matter, length and surface), mineral concentrations and carbohydrate concentrations in leaves cell wall. High or low rates of both calcium and boron had resulted in changes in anatomical characteristics of perennial soybean. When boron was supplied at 10 µmol L-1 plants presented deformed new leaves and abnormal root system growth.

ASSUNTO(S)

cell wall micronutrient cálcio fisiologia vegetal neonotonia wightii. nutrição vegetal soja. macronutrient morphophysiology morfologia vegetal boro

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