지중점적관비 재배에서 관수 기준 및 질소 추비량에 따른 콩 생육과 수량 반응

초록

To establish irrigation and nitrogen fertigation criteria for soybean (Glycine max (L.) Merr.) under subsurface drip fertigation (SDF), sequential pot and field experiments were conducted under sandy loam soil conditions. In 2021, the amount of irrigation required and electrical conductivity (EC) of the nitrogen-based fertigation solution were evaluated, and in 2022, field responses to nitrogen topdressing rates were examined. The amount of irrigation required to supply water to the soil surface was 24.3 ton/10a. In the pot experiment, EC 1.0 (N 2.4 kg/10a) facilitated the greatest nitrogen uptake, growth, and yield. Based on this result, field treatments were established with total nitrogen topdressing rates of N 2, 4, and 6 kg/10a, split equally between the R1 and R2 stages. In the field experiment, growth tended to increase with increasing nitrogen application rate, whereas seed yield was highest under treatment N2, which was 27.4% higher than that of the control. The number of nodules was also highest under N2 and decreased with increasing nitrogen topdressing rate. These results suggest that, in the sandy loam environment of this study, SDF at 24.3 ton/10a per fertigation event, with a total nitrogen topdressing of 2 kg/10a split between R1 and R2, is suitable for improving nodule formation and seed yield in soybean.

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