Abstract:

The object of this study was to explore the characteristics of dry matter accumulation of different mechanical planting methods in South China double-cropping rice region, to provide theoretical basis for the promotion of mechanical planting methods in rice production. The field experiment was conducted by using manual transplanting (P1) as control, and 4 mechanical planting methods (mechanical transplanting (P2), wide and narrow row precision hill-direct-seeding (P3), wide line and narrow plant precision hill-direct-seeding (P4), precision hill-direct-seeding together deep mechanized applying fertilizers (P5)). Results showed that: yields of early and late rice of P5 were the highest, reached 7.33 t/hm2 and 7.03 t/hm2, respectively. After heading, early and late rice matter accumulation of P5 were the highest and reach 16.57 t/hm2, 13.92 t/hm2 respectively, the mechanical planting methods matter accumulation showed no significant with P1; leaf area index and photosynthetic potential of P5 were the highest and reach 5.32, 4.74 and 122.07×104 (m2?d)/hm2, 163.63×104 (m2?d)/hm2 respectively, the highest growth rate of early rice was P5 reach 37.30 g/(m2?d), and that of late rice was P2 reach 14.92 g/(m2?d), compare with P1, very small part of leaf area index, photosynthetic potential and growth rate of mechanical planting methods showed significant level. According to the research results, the mechanical planting methods showed certain yield advantages, due to the indicators of matter production and accumulation, and P5 showed the most significant effect.