4 research outputs found
Efeitos das deficiĂȘncias de macronutrientes em duas variedades de soja (Glycine max (L.) Merr.), Santa rosa e UFV-1, cultivadas em solução nutritiva
Two soybean varieties were grown in nutrient solution in the presence and in conditions of deficiency of macronutrients (supplied at 1 tenth of full strength level). During the life cycle samples were taken for leaf analyses, as well as for the determination of the activity of nitrate reductase (NO3R). At the end of the pod filling, periodical mineral analyses were carried out in all the organs of the plants under the "complete" tratment; only leaves were analysed in teh remaining plants. The main conclusion were the following (1) symptoms of deficiency which showed up (N, P, K and Ca) are in agreement with those described in the literature; (2) plants deficient in N,P, K or Ca did not produce any pods; (3) there was a differential response in quantitative terms, of the two varieties to the deficiency of elements in the substrate; (4) the adequate levels of N, P, K, Ca, Mg and S are not the same for the two varieties; (5) quick tests provided and indication of the nutritional status; (6) NO3R activity reflected the level of N in the nutrient solution.Duas variedades de soja, Santa Rosa e UFV-1 foram cultivadas em solução nutritiva deficiente em macronutrientes. Foi possĂvel obter sintomas de carĂȘncia, verificar o efeito das deficiĂȘncias no crescimento, composição mineral e produção de vagens. Fez-se a diagnose foliar no caso de N, P e K e verificou-se o efeito do nivel de N na solução sobre a atividade da redutase de nitrato
Efeitos dos excessos de alumĂnio, cloro e manganĂȘs em dois cultivares de soja (Glycine max (L.) Merrill)
Two soybean cultivars, Santa Rosa and FV-1, were grown in nutrient solution in the presence of high concentrations of Al (24 ppm), CI (1750 ppm) and Mn (25 ppm). Observations, measurements and chemical analyses allowed for the following conclusions to be drawn: (1) symptoms of toxicity are in agreement with those described in the literatura; (2) the detrimental effect obeyed the decreasing order - Mn Al CI; (3) dry matter production by the variety UFV - 1 was relatively more affected by the treatments; (4) leaf analyses do not provide a reliable indication of the sensitivity of the two varieties to the high levels of the three elements in the substrate; (5) Ca/Al ratio in the roots keeps a good relationship with the relative tolerance of the two cultivas to excess Al in the medium.Dois cultivares de soja, Santa Rosa e UFV-1, foram cultivados em solução nutritiva na presença de excesso de alumĂnio, cloro e manganĂȘs. AlĂ©m de provocar o aparecimento de sintomas foliares (cloro e manganĂȘs) ou radiculares (alumĂnio), os elementos em excesso causaram diminuiçÔes no crescimento e impediram a produção de vagens. A anĂĄlise mineral das folhas mostrou a influĂȘncia dos tratamentos na composição do tecido