水稻氮高效品种资源筛选的初步研究Ⅰ.不同施氮水平下水稻产量和干物质生产的品种间差异

采用低、中、高3种施氮水平(公顷施氮量分别为25kg、125kg、225kg),对20个品种(系)的氮素利用效率进行了初步研究,结果表明:参试品种可划分为氮高效、氮低效、低中氮高效、高氮高效4种类型,其中吉03-2355、吉03-2843、吉06-56、吉生286为氮高效品种;吉06-39、吉06-44、吉03-55等为氮低效品种;吉粳66、吉06-55、吉粳81等为低中氮高效品种;吉粳88、吉06-43等为高氮高效品种。氮高效品种不论在低氮区、中氮区还是高氮区,产量和干物质产量均较高,尤其是在高氮区;氮低效品种则与其相反;低中氮高效品种只在低中氮条件下产量和干物质产量较高,而高氮高效品种在高氮条件下产量和干物质产量明显增加。

Preliminary Studies on Selection of High Nitrogen Utilization Rice Variety Resources I. Differences of Yield and Dried Mass Production among Rice Varieties under Different Nitrogen Application Rate

Nitrogen utilization efficiency of 20 rice varieties was studied under 3 Nitrogen application lev-el(25kg,125kg,225kg per ha).The results showed Nitrogen utilization of tested varieties was divided into four kinds: efficient,inefficient,efficient at low and medium Nitrogen level,and efficient at high Nitrogen level.Ni-trogen utilization of‘Ji 03-2355,’‘Ji 03-2843,’‘Ji 06-56’and‘Jisheng 286’were efficient,whereas that of‘Ji 06-39,’‘Ji 06-44a’nd‘Ji 03-55’were inefficient.Nitrogen utilization of‘Jijing 66,’‘Ji 06-55’and 'Jijing 81’ were efficient at low and middle Nitrogen level,while that of‘Jijing88’and‘Ji 06-43’were efficient at high Ni-trogen level.Rice varieties which Nitrogen utilization was efficient had high yield and high dried bio-mass yield no matter in low,medium and high Nitrogen area.On the contrary,rice varieties which Nitrogen utilization was inefficient had low yield and low dried bio-mass yield in all treatments.Rice varieties which Nitrogen utiliza-tion was efficient at low and medium Nitrogen level means they have high yield and high dried bio-mass yield in that condition.Rice varieties which Nitrogen utilization was efficient at high Nitrogen level means they have high yield and high dried bio-mass yield in that condition.