The Optimal Seeding Rate for Direct-seeding Rape with Different Tillage Methods in the Eastern Hunan
Using split plot experiment to study the influences of three seeding methods (trenching by machine and direct-seeding with shallow tillage, trenching by machine and direct-seeding with no tillage, and direct-seeding with no tillage) and different seeding rates on growth and yield of rape in triple cropping fields in the eastern Hunan province. The results showed that trenching by machine and direct-seeding with shallow tillage and trenching by machine and direct-seeding with no tillage are better than direct-seeding with no tillage. Seeding in late October, the optimal seeding rate for trenching by machine and direct-seeding with shallow tillage or trenching by machine and direct-seeding with no tillage was around 4.5 kg/hm2 (harvesting density was about 60xl04 plants/hm2). Direct-seeding with no tillage should adjust the soil moisture content and soil fertility and increase seeding rate according to local conditions.
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