Effect Of Semi-solid Sowing Patterns And Sowing Time On The Biological Characteristics Of Rice

The experiment was conducted from March to August,2017 at Wulong Community Test Base in Beisheng Town,LiuYang City,ZhongZao 39 and LuLiangYou 996 as the experimental materials,and the former crop was rice paddy.Research the influence of the rice growth conditions under different sowing date(March 13,March 23,April 3)and different ways(organic semi-solid,fertilizer semi-solid,conventional tillage).The main results were as follows:(1)As the postponement of sowing date,Agronomic characters of semi-solid state seedi ng mode in seedling stage,plant height,total root number,stem base width and stem weight i ncreased first and then decreased.The number of white roots decreases with the postpone of sowing time,but the trend of leaf area increases with the postpone of sowing time.While pl ant height,stem base width and stem weight of conventional tillage decreased with the postp onement of sowing date,and the number of white roots and total root number increased firs t and then decreased,but the trend of leaf area increased.(2)As the postponement of sowing date,significantly reduced in the whole stages,namely the longest whole stage was treatment Ⅰprocessing time of sowing,and the shortest whole stage was treatment Ⅲ processing time of sowing,shorten around 9 ~ 20 days,mainly to shorten from sowing to tillering around 7 ~ 19 days.The changes of tiller to ear,tassel and panicle to ripening stage were small,Probably because the rice’s temperature and light condition met the need of rice growth and development after tillering stage.(3)The effect of direct seeding methods on the stem number of rice fertility period was shown as the fertilizer semi-solid > organic semi-solid > conventional tillage.Maximum of rice population growth rate was at tillering stage to heading stage,and as the sowing date postponed,the growth rate of group growing to tillering stage showed an upward trend,the tendency of dry matter accumulation of tillering and earing period in organic semi-solid and conventional tillage decrease first and then increase.the photosynthetic material accumulation of direct seeding showed increasing trend along with the postponed sowing date,fertilizers semi-solid processing(April 3)was the highest while the organic semi-solid(March 13)was the lowest during the three important rice breeding periods of rice,the tillering stage,heading stage and maturity stage.(4)The production has been increased with the postponement of sowing date under semi-solid state seeding mode,It also showed corresponding characteristics of conventional tillage.With the postponement of sowing date,The highest yield treatment for fertilizer-semi-solid Ⅱ(March 23),the lowest for conventional tillageⅠtreatment(March 13).The rice yield was increased mainly by increasing the number of effective panicles and the postponement of sowing date.Semi-solid sowing can remit the reduced yield of rice due to early planting.