| Seven levels of zinc (0, 0.005, 0.02, 0.08, 0.32, 1.28, 5.12mg·L-1) , using nutrition culture, were given to study the effect of zinc on its growth, development and physiological metabolism in balsam pear (Momordica charantia Xinshijimeiya). The main results were submitted as fellows:(1) The demand of zinc for balsam pear to maintain its normal growth was increasing. The optimum concentration of zinc at seedling stage was 0.02 mg·L-1, sprouting and budding stage 0.08 mg·L-1, early flowering and fruiting stage 0.32 mg·L-1. Especially, higher concentration of zinc should be supplied at later flowering and fruiting stage to postpone the senescence of plants.(2) Symptom of deficient zinc in balsam pear became more obvious, and accumulated with further stress. And symptom from excessive zinc was more unsignificant with plant s growing, which was very serious at seedling stage.(3) Effects of zinc on growth in balsam pear were significant. Deficiency of zinc could dramatically inhibit the growth of shoots, such as plant height, stem diameter, the number of leaves on main vine and the dry weight of shoots. Effects of zinc on roots were different from that on shoots. Lightly deficient and excessive zinc could increase the roots length and the dry weight of roots. Only severe deficient and excessive of zinc could inhibit the growth of roots.(4) Zinc affected the development of balsam pear conspicuously. Zinc, supplied properly, could increase the growth and development of balsam pear and shorten the length of every growing stage. For example, vine stretching, flowering and fruiting was forward, so that early yield was increased. What s more, zinc application could postpone the senescence of plants of balsam pear.(5) The results showed that the control plants under low zinc exhibited a lower... |
PDF Full Text Request