Simultaneous seeding and shallow-tillage ridging in the cultivation of soybeans [Glycine max] in rotational upland field with wheat [triticum aestivum] as preceding crop
2007
Nakayama, T.(Shiga-ken. Agricultural Technology Promotion Center, Azuchi (Japan)) | Kawamura, H. | Kitaura, H. | Nakai, J.
In a rotational upland field with wheat as the preceding crop, soybean seed was successfully sown while simultaneously forming ridges using a machinery system comprising a riding tractor, ground driving seeder, and down-cut rotary tiller with an altered alignment of curved tines. Shallow-tillage ridging at a tilling depth of 5 to 6 cm enables the smooth plowing of wheat straw and hence the sowing of soybeans at a sowing depth of about 5 cm. Even when it rained heavily (about 40 mm rainfall) or during a drought (5.0 mm), in the first one week after seeding, good emergence was observed with an emergence rate of more than 80%. Compared to traditional practice, our method of simultaneous seeding and shallow-tillage ridging for soybeans produced lower soil moisture content and higher stable emergence rates in the emergence stage to early growing stage, and is expected to increase the quantitative growth until the flowering stage and stabilize the yield.
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