Resumos
Foram induzidas deficiências de macronutrientes em duas cultivares de Vigna sinensis cultivadas em solução nutritiva. A determinação da matéria seca das diferentes partes permitiu verificar o efeito da falta de um nutriente no crescimento e na produção. As análises minerais forneceram indicações que ajudam na avaliação do estudo nutricional.
Vigna sinensis, varieties "Dorminhoco" and "Pitiúba", was grown in nutrient solution in the presence and absence of macronutrients; leaves (upper and lower) were collected for analysis at the and of the life cyle or when symptoms of deficiency were marked. Variations found in leaf composition agree, as a rule, with what is contained in the literature with regards to other species under the same type of experimental conditions: reduction in concentration in the tissue when the element was absent from the substrate; interionic, counter ion, and dilution effects. The following levels of macronutrients were associated with maximun growth: N=1.97 ± 0.16; P=0.14 ±0.03; K= 3.20 ± 0.36; Ca=5.38 ± 0.41; Mg=0.66 ± 0.14; S=0.15 ± 0.04. As indication of deficiency, on the other hand, the corresponding leaf contents would be: N =1.28 ± 0.13; P = 0.02 ± 0.01; K=0.64 ± 0.10; Ca=1.79 ± 0.24; Mg=0.14 ± 0.05; S=0.05 ± 0.01. Due to the large differences found between foliar composition in the control and the deficient plants it is very likely that under field conditions deficiencis may occur when the level of a given element in the leaves is higher than those presented herein. Dry matter was affected in the following decreasing ords: Complete, -S, -Mg, -P, -K, -Ca, -N; therefore, the lowest yield was obtained in the treatment lacking nitrogen.
Estudos sobre a nutrição mineral do feijão macassar (Vigna sinensis (L.) Endl.) II. efeitos das carências de macronutrientes no crescimento, produção e composição mineral* * Parte da dissertação de mestrado em Solos e Nutrição de Plantas, ESALQ-USP, Piracicaba, SP. apresentada pelo primeiro autor.
Studies on the mineral nutrition of Vigna Sinensis. II. effects of deficiencies of macronutrients on growth, yield and leaf composition
J. Pires DantasI; H. Bergamin FilhoII; E. MalavoltaII
IFac. Ciências Agrárias, UFPB, Areia, PB
IIDepartamento de Química e CENA, E.S.A. "Luiz de Queiroz", USP
RESUMO
Foram induzidas deficiências de macronutrientes em duas cultivares de Vigna sinensis cultivadas em solução nutritiva. A determinação da matéria seca das diferentes partes permitiu verificar o efeito da falta de um nutriente no crescimento e na produção.
As análises minerais forneceram indicações que ajudam na avaliação do estudo nutricional.
SUMMARY
Vigna sinensis, varieties "Dorminhoco" and "Pitiúba", was grown in nutrient solution in the presence and absence of macronutrients; leaves (upper and lower) were collected for analysis at the and of the life cyle or when symptoms of deficiency were marked.
Variations found in leaf composition agree, as a rule, with what is contained in the literature with regards to other species under the same type of experimental conditions: reduction in concentration in the tissue when the element was absent from the substrate; interionic, counter ion, and dilution effects.
The following levels of macronutrients were associated with maximun growth: N=1.97 ± 0.16; P=0.14 ±0.03; K= 3.20 ± 0.36; Ca=5.38 ± 0.41; Mg=0.66 ± 0.14; S=0.15 ± 0.04. As indication of deficiency, on the other hand, the corresponding leaf contents would be: N =1.28 ± 0.13; P = 0.02 ± 0.01; K=0.64 ± 0.10; Ca=1.79 ± 0.24; Mg=0.14 ± 0.05; S=0.05 ± 0.01. Due to the large differences found between foliar composition in the control and the deficient plants it is very likely that under field conditions deficiencis may occur when the level of a given element in the leaves is higher than those presented herein.
Dry matter was affected in the following decreasing ords: Complete, -S, -Mg, -P, -K, -Ca, -N; therefore, the lowest yield was obtained in the treatment lacking nitrogen.
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LITERATURA CITADA
Entregue para publicação em 14.09.1979.
- DANTAS, J.P.; BERGAMIN Fş, H. & MALAVOLTA, E., 1979. Estudos sobre a nutrição mineral do feijão macassar. I. Deficiências minerais. Anais E.S.A. "Luiz de Queiroz"- no prelo.
Datas de Publicação
-
Publicação nesta coleção
11 Maio 2012 -
Data do Fascículo
1979
Histórico
-
Recebido
14 Set 1979
