【摘要】 以盐粳9号(小穗型)、淮稻9号(中穗型)和9优418(大穗型)为机插材料,研究了每穴栽插苗数对不同穗型水稻产量、品质的影响。结果表明,随穴栽苗数的增加,3种穗型品种的穗数均呈增加趋势,每穗颖花数、结实率和千粒重均呈减小趋势,但变化程度不一。3种穗型品种的产量随穴栽苗数增加均呈先增后减二次曲线变化。小、中、大穗型品种最高产量对应的穴栽苗数分别为4、3、2苗。3种穗型品种稻米的品质性状受穴栽苗数影响的变异程度存在差异,但均表现随穴栽苗数的增加而垩白度和垩白率上升,糙米率、精米率和整精率下降,蛋白质含量变低,直链淀粉含量增加,胶稠度变长;峰值黏度、热浆黏度、崩解值、最终黏度和起始糊化温度等RVA特性值先增后减,而消减值先减后增。对产量与品质指标综合评价,以小穗型品种每穴栽插4苗、中穗型品种每穴3苗、大穗型品种每穴2苗,最利于相对实现高产与优质的协调。更多还原

【Abstract】 Field experiment was conducted under the rice-wheat two-ripe systems at the Lixia River area during the year 2006-2007,three mid-season japonica rice cultivars including Yanjing 9(small panicle type),Huaidao 9(medium panicle type) and 9 you 418(large panicle type) were adopted to investigate the effects of five planting densities on yield and quality of me-chanical-transplanted rice.Results showed that with the increase of seedlings per hill,the final panicles per plant increased while the number of grains per panicle,the grain filling rate and the 1000-grain weight decreased;and the yield of three cultivars increased first and then decreased.The highest yield was obtained when rice was transplanted with 4 seedlings per hill for small panicle type,with 3 seedlings per hill for medium panicle type and with 2 seedlings per hill for large panicle type.With the increasing of seedlings per hill,the chalkiness degree,the chalkiness rate and the amylose content increased while the milled rice qualities and the protein content decreased,and the gel consistency became longer.Among all of the RVA profiles,the peak viscosity,hot viscosity,breakdown,the final viscosity and the pasting temperature increased first and then decreased.The setback decreased first and then increased.Considering the grain yield together with quality,we suggest that for the coordination of high-yielding and high quality rice transplanting should be with 4 seedlings per hill for small panicle type rice,3 seedlings per hill for medium panicle type rice and with 2 seedlings per hill for large panicle type.更多还原