ACTA AGRONOMICA VOLUME 40. (A MTA AGRÁRTUDOMÁNYI KÖZLEMÉNYEI, 1991)

1991 / 1-2. szám

CONTENTS SOIL SCIENCE AND AGROCHEMISTRY Preparation of native clay-humus complexes from soil by chemical extraction I. Búzás, J. Meisel, G. Mády, Z. Sándor and B. Lakatos 3 Extraction and fractioning of soil humic acids by electroelution Gy. Mády, I. Búzás, F. Havasi, Z. Sándor and В. Lakatos 13 Effect of prolonged fermentation of biogas manures on their fertilizing efficiency M. M. El-Shinnawi, S. A. El-Shimi and M. A. Badaivi 31 PLANT PHYSIOLOGY AND BIOCHEMISTRY Effect of toxic metals inhibiting the growth of plant callus tissues (IV.) M. Maróti and J. Bognár 39 Influence of shading on production of cucumber in the late summer season in Egypt F. El-Aidy, S. Moustafa, A. El-Zawily and A. El-Kasas 49 Effect of gamma radiation and temperature on potatoes during storage. II. Physiological and biochemical changes 0. M. Alwakdi, I. Pál, P. Szőke and J. Beczner 57 Characterization of bean and maize genotypes by photosynthetic parameters during the start of illumination L. Técsi, К, Margóczi and I. Maróti 69 PLANT CULTIVATION Optimum NPK ratio of a planted grassland T. Bánszki 79 Response of safflower to different levels of nitrogen, phosphorus and potassium Fathy S. El-Nakhlawy 87 Effect of oxamyl on macronutrients of the soil and growth of tomato plants in presence of Meloidogyne incognita R. P. Singh, K. Kumari and S. K. Saxena 93 Evaluation of rape-seed potential as affected by row spacing and nitrogen fertilization Fathy S. El-Nakhlatvy and Mohamed A. El-Faival 103 Pyridoxine augments growth, yield and quality of mustard through efficient utilization of soil-applied NP-fertilizers Samiullah N. A. Khan, S. A. Ansari and M. M. R. K. Afridi Ill PLANT GENETICS AND BREEDING Early mutants of pea (Pisum sativum L.) induced by some mutagens Vo Hung 117 Analysis of combining ability for seed-oil content in cotton (Gossypium hirsutum L.) R. G. Dani 123 Studies on quantitative characters of pea varieties affected by acute and recurrent gamma irradiation K. Mázik-Tőkei and J. Füredi 129

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