Results showed that by using straw and plastic film dual mulch in dry - cultivation of rice planting , both of the range of temperature difference and the loss of water in dry - cultivated field of rice were decreased , the soil structure was improved , the soil nutrient contents were increased , the ineffective tillers of rice plant were decreased , the growth and development stage were advanced , the filling stage was extended , the grain per ear and 1 000 grain weight were raised , the grain yield of rice increased obviously 水稻秸秆+地膜二元覆盖旱作栽培效应的研究结果表明，秸秆+地膜二元覆盖旱作稻田土壤变温幅度降低，水分散失减少，结构改善，养分积累增加；水稻无效分蘖减少，生育转变提前，灌浆结实期延长，穗大粒多，千粒重高，增产效果显著。
The results showed , compared with experimental common wheat , annong waxy 1 should be improved in plant - height , ear - length , 1000 - kernel weight by hybridism and back - cross , while the difference among protein content , ash content , wet gluten contents were not significant , but the waxy wheat grain hardness value was lower 结果表明，与供试的普通小麦品种（系）相比较， “安农糯1 ”在株高、穗长和千粒重等农艺性状上均不理想，需要通过杂交和回交等方式进一步改良；蛋白质含量、灰分、湿面筋含量等变化不大。
When sparsely - planted rice overgrew its earing period , light intensity in the mid - lower part increased , photosynthesis prolonged , activity of nitrate and peroxide decreased , protein content increased by more than 50 % , velocity of leaf ageing slowed , but accumulation of dry matter of grain accelerated and 1000 - grain weight increased too 摘要稀植栽培的水稻，抽穗后田间表现为中下部光强明显增加，光合作用时间延长，硝酸还原酶和过氧化物酶活性降低，蛋白质含量增加50 %以上，叶片衰老延缓，籽粒干物质积累加速，千粒重提高。
( 4 ) the results of qtl mapping indicated that the inheritance of yield traits was very complex , the explanation as follows : additive effects except for sterile spikelet number per spike ( ssns ) , qtls of additive effects were tested for all other traits , with 10 qtls for 1000 grain weight ( kgw ) . the large variance of the effect values and the contribution rate of qtls indicated that the effects are difference for different qtls 14 。 （ 4 ）通过对产量性状qtls作图，发现产量性状的遗传非常复杂，可以从4个方面说明：加性效应除不孕小穗数外，各性状均检测到了表现加性效应的qtls 。其中，在各环境联合分析下，检测到了10个千粒重qtls ，各qtls的加性效应值和对群体变异的贡献率也存在很大差异，说明不同的qtls不是等效的。
Consequently , it should be concluded that increasing kernels per plant should be put on the priority position , and improving yield of inbred lines also be solved comprehensively by imposing high density stress to inbred lines , heavier kernel weight , harmony of asi , paying much attention to more upright ones and higher resistance to lodging with ear position and maturity days under the proper level 同时通过保持穗位、生育期在适当水平，强化耐密性的选择，选择千粒重高、雌雄协调、株型上举耐密且抗倒能力强的自交系，才能最终提高玉米自交系的产量。
