Effects of Sowing Time and Root Injury Treatment on the Growth and Development of Mechanically Transplanted Seedlings During the Greening Period
To investigate the effects of different sowing dates and root injury treatments on the growth characteristics and photosynthetic pigment content of machine transplanted rice seedlings during the greening period,Xiangzaoxian No.6 and Zhuliangyou 819 were used as experimental materials.Three different sowing dates(early rice season T1,middle rice sea-son T2,and late rice season T3)and three different root injury treatments(no root injury,2 cm root injury,1 cm root inju-ry)were set up to measure the plant height,root length,dry matter accumulation,and chlorophyll content changes of the seedlings during the greening period.The results showed that compared to the early rice season,Xiangzaoxian No.6 and Zhuliangyou 819 significantly increased plant height,fresh and dry weight in the aboveground and underground parts during the greening period of the middle and late rice seasons.At different sowing dates,the 1cm root retention treatment resulted in a decrease in plant height,main root length,fresh and dry weight of the above ground and underground parts of Xiang-zaoxian No.6 and Zhuliangyou 819,but no significant differences were observed among different root injury treatments.At the same time,the sowing date significantly affected the chlorophyll content of the two varieties during the greening period,especially on the 15th day after transplantation,the chlorophyll a,chlorophyll b,total chlorophyll,and carotenoid content in the middle and late rice seasons decreased significantly earlier in the rice season.In the early stage after transplantation,the content of chlorophyll a,chlorophyll b,total chlorophyll,and carotenoids decreased with the increase of root injury de-gree.However,after 12 days of transplantation,there was no significant difference in chlorophyll a,chlorophyll b,total chlo-rophyll,and carotenoids among different root injury treatments.Overall,compared to root injury treatment,the effect of so-wing time on the growth of machine inserted rice seedlings during the green period is more significant.This study lays the foundation for the study of physiological regulation mechanisms during the greening period of machine inserted rice.
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