为探索再生稻机械化生产的增产途径,在潭香稻谷专业合作社对甬优2640和佳辐占两品种的双季产量及其构成进行分析,结果表明:甬优2640矮秆抗倒,穗大粒密,双季产量分别为(10 598±1 433)和(10 126±1 527)kg/hm2;佳辐占熟期短,适应闽北安全生长期短的气候生态,双季产量分别为(7 006±1 399)和(6 443±1 357)kg/hm2.再生稻产量由单位面积(m2)穗数、每穗粒数、结实率和千粒质量4个因素构成.2个品种的结实率和千粒质量变异小,与产量无显著相关性;单位面积穗数和每穗粒数变异大,与产量呈显著或极显著正相关,且由此二者组成的单位面积总粒数的变异更大,与产量的相关性更高,对增产的贡献率>0.97,是决定产量的主要因素;而单位面积总粒数与单位面积穗数、每穗粒数呈显著或极显著正相关,其中头季与单位面积穗数的相关度更高,再生季与单位面积穗数、每穗粒数的相关度差距不大.因此,提高再生稻机械化生产的产量主攻方向是扩增单位面积总粒数,而扩增单位面积总粒数必先扩增单位面积穗数和每穗粒数,其中头季侧重扩增单位面积穗数,再生季兼顾扩增单位面积穗数和每穗粒数. In order to explore the mechanized production of ratooning rice, the double crop yield and its composition of Yongyou 2640 and Jiafuzhan were studied in Tanxiang paddy cooperatives. The results showed that Yongyou 2640 dwarf stalk resistant and spike large grain (10 598 ± 1 433) and (10 126 ± 1 527) kg / hm2 respectively in the two seasons, and the shortest climatic niches in Jiafu were suitable for the short-term safety climate in northern Fujian. The double crop yields were (7 006 ± 1 399 and 6 443 ± 1 357 kg / hm2, respectively.The yield of ratooning rice was composed of four factors per panicle (m2) panicles, grains per panicle, seed setting rate and grain weight per plant The results showed that there was no significant correlation between yield and grain yield per plant, and there was no significant correlation between yield and grain yield per plant. Spike number per panicle and grain number per panicle varied greatly with positive or negative correlation with grain yield, and the total grain number per unit area The variation was greater, the correlation with yield was higher, and the contribution rate to yield was> 0.97, which was the main factor to determine the yield. The total grain number per unit area had a significant or extremely significant positive correlation with the spikes per panicle and grain number per spike , Of which the correlation between the first season and the spikes per unit area is higher, the number of spike per unit area and grain per spike correlations between the number of gaps is not Therefore, to improve the mechanization of ratoon rice production is the main direction of amplification of the total number of particles per unit area, and the total number of units per unit area of ​​amplification must first increase the number of spike per unit area and grains per spike, which focus on the first quarter of amplification The number of spikes per unit area, the regeneration season take into account the number of spikes per panicle and grains per spike.