
Chinese Journal OF Rice Science >
Effects of Variety and Seeding Rate Interaction on Nutrient Competition Between Mechanized Dry Direct Seeded Rice and Weeds
Received date: 2023-08-08
Revised date: 2023-09-20
Online published: 2024-03-14
【Objective】To clarify the effect of mechanical dry direct seeded rice varieties and sowing rates on weed growth inhibition, laying a theoretical basis for achieving high-quality, high-yield, green, and efficient cultivation techniques in mechanical direct seeded rice.【Method】Using the three-line hybrid rice Chuankangyou 6308 (C1) and the two-line hybrid rice Jingliangyou 534 (C2) as test materials, three sowing rates of 15 kg/hm2 (S1), 22.5 kg/hm2 (S2), and 37.5 kg/hm2 (S3) were set to study their effects on dry matter accumulation, nutrient accumulation, and transport of the main weeds in the rice field during the critical growth period. The study also explored the relationship between rice and weed nutrient competition under the interaction of varieties and sowing rates.【Results】1) At 29 days after direct seeding, the density of weeds in the paddy fields increased significantly by 39.29% to 47.16% compared with that of rice, with the dry weight ratio and nutrient accumulation ratio of weed to rice population being higher than 1∶1, necessitating weed control. 2) Before weeding, weed density of variety C1 significantly decreased by 91.34% to 96.54% compared to C2, with dry matter accumulation of rice increasing by 19.21% to 30.24%, and nitrogen, phosphorus, and potassium accumulation increasing by 7.17% to 34.59%. For the same variety, increasing the sowing rate significantly reduced weed amount by 21.95-109.69%, increasing rice dry matter accumulation by 39.78-94.52%, and nitrogen, phosphorus, and potassium accumulation by 10.11-50.79% compared to S1 treatment. 3) After weeding and 43 days of direct seeding, weed number significantly decreased. The dry matter accumulation of C1 increased by 54.12% to 66.97% compared to C2, with nitrogen, phosphorus, and potassium nutrients increasing by 15.56% to 47.45%. For the same variety, S2 and S3 treatments significantly increased rice density by 14.94-32.34%, dry matter accumulation by 24.45-85.07%, and nitrogen, phosphorus, and potassium nutrients by 21.62-98.34% compared to S1 treatments. However, with the increase of sowing amount, nitrogen, phosphorus, and potassium nutrient transport amount and rate during the filling period, as well as rice yield, showed an increasing-decreasing trend, with S2 treatment being the highest.【Conclusions】Based on comprehensive inhibition of weed growth and rice yield characteristics, this experiment selected Chuankangyou 6308 for mechanical dry direct seeding with a seeding rate of 22.5 kg/hm2. Considering the higher total density of weeds in the rice field compared to rice, and the 1∶1 dry weight and nutrient ratio of weeds to rice population, optimal weeding timing can be achieved. This leverages the advantages of the interaction between rice varieties and seeding rates to control weed growth, reduce herbicide use, and improve yield.
Key words: machanized direct seeding; rice; variety; seeding rate; weed competition; nutrients
YANG Yonggang, YUAN Xiaojuan, CAO Yun, CHEN Xuefang, YIN Huilai, WANG Zhiqiang, WEN Yanfang, YANG Zhiyuan, SUN Yuanyuan, JIA Xianwen, MA Jun, SUN Yongjian . Effects of Variety and Seeding Rate Interaction on Nutrient Competition Between Mechanized Dry Direct Seeded Rice and Weeds[J]. Chinese Journal OF Rice Science, 2024 , 38(2) : 185 -197 . DOI: 10.16819/j.1001-7216.2024.230803
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