免耕半固态直播对水稻的生长及产量构成的影响

以水稻中早39为材料,采用免耕半固态直播(破胸稻种与稀泥以一定比例混合,播种在免耕的稻田里,NS),以传统直播为对照(CK),通过测定单株地上部干物质积累量、分蘖动态变化、SPAD值和叶绿素含量等,研究免耕半固态直播对水稻生长及产量构成的影响。结果表明:在三叶期和分蘖期,2个处理的单株地上部分干物质积累量差异没有统计学意义,但孕穗期和齐穗期NS处理的单株地上部干物质积累量分别为7.84、14.45 g,与CK相比,差异均达到极显著水平;NS处理的单株分蘖数为2.67,CK处理的单株分蘖数为2.56,两者的差异无统计学意义;在抽穗期,NS处理植株的倒二叶SPAD值达到最大,为46.90,与CK比较,差异极显著;9月9日,NS处理植株的剑叶SPAD值、叶绿素a和叶绿素b含量均出现最大值,SPAD值为45.96,叶绿素a和叶绿素b分别为6.38、2.24 mg/L;NS和CK处理的产量分别为7.31、6.94 t/hm2,差异达显著水平。

Effect of no-tillage and direct seeding with semisolid soil on growth character and yield components of rice

In this experiment, rice variety Zhongzao 39 was used as material, a treatment of no-tillage and direct seeding (the chest-bursting seeds mixed with semisolid soil and sowing directly in no-tillage rice paddy) and a traditional direct seeding (CK) were designed and the amount of dry matter, dynamic changes of tillers, SPAD value and the amount of chlorophyll were measured, to study the growth character and yield components of rice. The results showed that the difference of the amount of dry matter between the NS treatment and the CK was no significant in three-leaf stage and tillering stage. The amounts of dry matter of the NS treatment were 7.84 and 14.45 g in booting stage and full heading stage respectively, which were significantly higher than those of CK. The tillers per plant of NS and CK were 2.67 and 2.56 respectively, the difference of them was no siginificant. The SPAD value of the penultimate leaf in the heading stage was the biggest, which was 46.90, it was significantly higher than that of CK. The contents of chlorophyll a and chlorophyll b and the SPAD value of the flag leaf reached the highest level on September 9th, SPAD value was 45.96, chlorophyll a and chlorophyll b were 6.38, 2.24 mg/L respectively. The yields of NS and CK were 7.31 and 6.94 t/hm2 respectively, the difference of them was a very significant.