Effects of irrigation amount and aeration on seedling growth and photosynthetic characteristics of dry and wet cotton fields
In order to investigate the effects of irrigation amount and aeration on chlorophyll,photosyn-thetic characteristics and dry matter of dry-seeded wet-emergent cotton seedlings,six treatments(WP1,WP2,WP3,WP4,WP5 and WP6)were designed for the experimental study.The irrigation quota for WP1,WP2 and WP3 treatments was 150,225 and 300 m3/hm2,respectively,with corre-sponding irrigation amounts of 3 600,5 400 and 7 200 L/hm2,respectively.The irrigation quota of WP4,WP5,and WP6 treatments was 150,225 and 300 m3/hm2,respectively,and the experimental treatments were not aerated(as a control).The results show that with the increase of irrigation amount and aeration,the chlorophyll content of cotton seedling leaves increases first and then decreases,and the chlorophyll content of cotton seedling leaves increases by 12.56％compared with those without ae-ration.Aeration can increase maximum fluorescence under light,maximum light energy utilization effi-ciency under light,potential photochemical activity of the photosystem PS Ⅱ under light,and actual primary light energy capture efficiency.Compared with non-aerated treatment,the net photosynthetic rate,transpiration rate,and stomatal conductivity of leaves in aerated treatment increase by more than 0.4 μmol/(m2·s),0.2 mmol/(m2·s)and 3.0 mmol/(m2.s),respectively,and the intercellular CO2 concentration decreases by more than 9 mmol/mol.Under the same irrigation quota,the dry matter of aerated treatment significantly increases than that of non-aerated treatment,and the dry matter of WP2 treatment increases significantly.Aerated irrigation can significantly increase the chlorophyll con-tent,enhance photosynthesis,and increase dry matter accumulation in cotton leaves.
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