Tillage system and row spacing effects on soil moisture and on growth and yield of soybean (Glycine max (L) Merill) grown in rainfed lowland soils
2010
Amano, L.O. | Amano, V.L., Bicol Univ., Guinobatan, Albay (Philippines). Coll. of Agriculture and Forestry
A field experiment was conducted to determine the effect of tillage system and row spacing on soil moisture content and on growth and yield performance of soybean (UPL Sy2) 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: furrowing (F), plowing + harrowing (P + H), plowing + rotovation (P + R), and conventional tillage (C) are assigned in the mainplot and row spacing (25 and 50 cm) were assigned in the subplot. Drought condition prevailed during the conduct of the experiment. Total amount of rainfall recorded from sowing to 10 weeks after planting (WAP) was only 133.4 mm. In both soil types, soil moisture content showed the same trend of result in the order of F P + H P + R C as far as tillage system is concerned. Soybean response to tillage system was similar in both soil types but greater effects of tillage were observed in Guinobatan sandy loam than in Ligao clay loam type of rainfed lowland soil. The relative yield advantage of less tilled soils (F and P + H tillage systems) over the highly tilled soils (P + R and C tillage systems) in terms of moisture conservation in both soil types was associated to the significantly higher dry matter yield, higher proportion of three- and two-seeded pods, and greater number of pods per plant. The 25-cm row spacing showed no significant yield advantage over the 50-cm row spacing in both soil types under below normal precipitation.
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