The effect of water deficit in typical soil types on the yield and water requirement of soybean (Glycine max (L.)Merr.) in Indonesia
2007
Rosadi, R.A.B.(University of Lampung, Sumatra (Indonesia)) | Afandi. | Senge, M. | Ito, K. | Adomako, J.T.
An experiment was conducted with the objective to investigate the influence of available water deficit in typical soil types on the yield and crop water requirement of soybeans in Indonesia. This research was conducted in a plastic greenhouse of the University of Lampung from June to August 2005. A factorial experiment was arranged in randomized block design with three replications. The soil type (S) was the first factor with two different soil types. Ultisol (S1), and Latosol (S2). Water deficit (D) was the second factor with five levels including D1 (0-20%), D2 (20-40%), D3 (40-60%), D4 (60-80%), and D5 (80-100%) of water deficit from the total available water (TAW). For example, D1 (0-20%) meant that water was given to maintain the available water depletion between 0% and 20% of TAW in the root zone. Yield under full irrigation in Ultisol (21.3 g/pot) was 2.3 times as much as in Latosol (9.3 g/pot). Yield efficiency (the ratio of yield to crop water requirement) in Ultisol was the greatest under deficit irrigation of 30% of available water deficit (0.0083 g/g), which was 1.26 times as much as under full irrigation (0.0066 g/g). However, yield efficiency of Latosol was the greatest under full irrigation (0.0049 g/g). Therefore, yield efficiency of soybean in Ultisol was 1.8 times as much as in Latosol.
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