TILLAGE SYSTEM AND NITROGEN MANAGEMENT EFFECTS ON GROWTH AND YIELD OF SOYBEAN Glycine max (L) Merill) GROWN IN RAINFED LOWLAND SOILS

Luis O Amano, Viola L Amano

Abstract


A dry-season field experiment was conducted to assess the effect of tillage system and nitrogen management on the growth and yield performance of soybean (UPL Sy 2) in Ligao clay loam and Guinobatan sandy loam types of rainfed lowland soil. The experiment was laid-out in Split plot in Randomized Complete Block Design with three replications. Tillage systems namely: plowing + harrowing (P+H) and conventional tillage (C) was assigned in the mainplot. Nitrogen management namely; all of the recommended nitrogen was applied evenly by hand at planting (N1), 2 3 of the recommended N was applied basally at planting and the remaining 1 3 was sidedressed at flowering stage (N2), 2 3 of the recommended N was applied basally at planting and the remaining 1 3 was sidedressed at pod formation stage (N3), 2 3 of the recommended N was applied basally at planting and the remaining 1 3 was applied foliarly at flowering stage (N4), 2 3 of the recommended N was applied basally at planting and the remaining 1 3 was applied foliarly at pod formation stage (N5), and 2 3 of the recommended N was applied basally at planting and the remaining 1 3 was applied foliarly in equal doses at flowering and pod formation stages (N6), was assigned in the subplot Drought condition prevailed during the conduct of the preliminary experiments. Total amount of rainfall recorded from sowing to 10 weeks after planting (WAP) was only 133.4 mm. Foliar N application when used as supplement and not as substitute for standard soil fertilization was beneficial for soybean production. Combining early soil application and foliar application of N at flowering was effective in increasing yield in both soil types. Yield increase was attributed to higher number of pods per plant mainstem and branch yield.

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Bicol University
Research and Development Center
Legazpi City