南方温室不同时段遮阳降温效果及对甜椒生长发育和产量的影响

该试验主要研究了南方温室中一天内不同时段遮阳降温效果及对甜椒生长发育及产量的影响.结果表明,各处理遮阳降温效果显著,最大降温幅度可达7℃,但不同时段及不同时间长度遮阳降温效果差异不大,有效降温和有效降温时间段基本是一致的.不同时段遮阳降温对甜椒生长发育及产量的影响差异较大,在中午1200至下午1500时间段进行遮光降温,植株净光合速率最高,叶片叶绿素含量增加,促进生殖生长,提高坐果率,甜椒前期产量和总产量显著提高.随着遮阳降温时间的段前移和延长,植株表现徒长,叶绿素含量、净光合速率及坐果率降低,产量明显降低.

Sunshading and cooling effects of southern greenhouse under different periods and its influences on growth, development and yield of the sweet pepper

The test dealt with main research on the southern greenhouse sun shading and cooling result under(different) periods in one day and the influence on growing and output of sweet pepper.The result indicates that the result of lowering temperature is remarkable under different treatments,sunshading can reduce by 7 degrees Centigrade at most.But there is no very big difference of cooling effects under different periods and time lengths,and it is the same basically to lower the temperature effectively and the temperature lowering time. Sunshade and cooling impact on sweet pepper growth and output differs greatly under different periods,sun shading to cool from 12:00 at noon to 15:00 in the afternoon,net photosynthetic rate is the highest,the content of blade chlorophyll increases,promotes reproduction to grow,raise a fruit rate, previous output of the sweet pepper and total output are raised remarkably.Moving forward and lengthening the period of time of sunshading and cooling,the plant displays the excessive growth,the content of chlorophyll,net photosynthetic rate and the number of fruit per plant decrease,and the output is obviously reduced.