油葵蕾期对微咸水水质的适应性研究

采用田间试验的方式,分别以淡水和矿化度为3 g/L、4 g/L、5 g/L、6 g/L的微咸水作为油葵蕾期水,以蕾期缺水处理作为对照,研究了油葵蕾期对微咸水矿化度的适应程度.结果表明:油葵整个生育期结束时,各处理主根层土壤含盐量均达到底墒水前的初始值附近,无显著的脱盐与积盐现象;蕾期采用3 g/L的微咸水灌溉, 对油葵生长非但不会造成抑制,反而还有一定的促进作用,使其株高、茎粗、盘粒数、百粒重及产量均超过淡水处理;油葵蕾期采用矿化度为5 g/L以下的微咸水进行灌溉,产量不会显著降低;在淡水资源不足或有限的情况下,6 g/L也可以考虑用于油葵蕾期灌溉,虽然会造成一定程度的减产,但与蕾期缺水的情况相比较,在不显著增大土壤含盐量的情况下仍然可以较大程度提高产量.

Adaptability study on salinity of irrigation water to bud stage of Helianthus annuus

To study the adaptability on salinity of irrigation water to bud stage of Helianthus annuus, the field plot experiments have been adopted, and sal inity of ir rigation water for increasing soil water in bud stage have been divided into fiv e levels (fresh water、3 g/L、4 g/L、5 g/L、6 g/L), the water shortage in bud stage treatment as contrast. The results show that soil salinity of 0～40 cm soil horizon of all treatments have reached the near of initial value withou t notable desalination or salification when growth duration finished. Using the saline water whose total salinity is 3 g/L, the growth of Helianthus annuus not only ha ven't been restrained but also have been stimulated with plant height and stem diameter, he number of one disc's grain, hundred weight of grain and yield, are all greater than the ones of fresh water treatment. The yield of Helianthus a nnuus will not drop notably using water with total salinity under 5 g/L to irr igate on bud stage. On the condition of freshwater resource shortage, the water whose tot al salinity is near to 6 g/L can be take into account to irrigate Helianthus annuus on its bud stage with a increase of production and without increase of soil salt content compared with water shortage treatment.