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International Journal of Agricultural Research

Year: 2012 | Volume: 7 | Issue: 7 | Page No.: 345-357
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Authors

S.M. EL-Baz

El.El. Abbas

R.A.I. Abo Mostafa

Keywords

Research Article

Effect of Sowing Dates and Humic Acid on Productivity and Infection with Rot Diseases of Some Soybean Cultivars Cultivated in New Reclaimed Soil

S.M. EL-Baz, El.El. Abbas and R.A.I. Abo Mostafa
Two experiments were conducted at the experimental farm of Tag El-Ezz Research Station, Dakahlia Governorate, North Delta, Egypt, during 2010 and 2011 summer seasons. The field soil (new reclaimed soil) was clayey-loam in texture with medium salinity (EC = 2534 ppm). May 20th sowing date gave the highest values of all studied characters except for root rot and stalk rot disease severity which gives inverse this. The maximum seed yield (ton/fad) occurred under May 20th sowing date in Giza 83 cultivar in both seasons. Humic acid at 1000 ppm led to the highest values of yield and seed quality (protein and oil %). Moreover, the highest values of growth parameters occurred under the application of humic acid at 2000 ppm. May 20th sowing date interacted with Giza 83 cultivar was more effective in increasing Plant height, 100-seed weight, number of pods/plant, seed weight/plant and seed yield/fed The interaction between sowing date (May 20th) and humic acid (2000 ppm) gave the same effect. On the other side the maximum reduction in disease severity of damping-off, root and stalk rot diseases was recorded with Giza 83 in May 20th sowing date under application of humic acid at 1000 ppm. The present investigation recommend soaking seeds of Giza 83 cultivar in humic acid at 1000 ppm for 20 min then sowing it on May 20th and sprayed plants twice (after 50 and 65 days from sowing) with the same concentration to maximize the crop yield and minimize the disease severity of damping off and root and stalk- rots.
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