Nutrição mineral de hortaliças: VIII. deficiências de macronutrientes em cenoura

Abstract

Carrot seeds (Daucus carota L.var. Shin Kuroda) were sowed in pots containing quartz. After seeds germination the seedlings were irrigated during 35 days with complete nutrient solution. Further groups of plants were exposed to the following treatments: complete solution, -N, -P, -Ca, -Mg and -S. Deficiency symptoms were described, with exception for K. Plants were harvested and divided in leaves and roots. Chemical analysis for the macronutrients were run of the parts. The percentage of the macronutrients in the dry matter of the leaves of healthy plants were: N-2.10, P-0.20, Ca-2.50, S-0.43. Plants showing deficiency symptoms in the leaves presented the following values: N-0.79, P-0.09, Ca-0.77, Mg-0.05 and S-0.12.