| Effect of supplying CaCO3 and Zn in the nutrient solution on growth and Zn、P uptake of winter wheat plants of five genotypes |
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| DOI：10.7606/j.issn.1000-7601.2006.06.03 |
| Key Words: CaCO3 Zn genotypes of winter wheat biomass P P/Zn |
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| Abstract: |
| In order to investigate the effects of supplying rates of calcium carbonate(0,10,30,60 mg/L) and zinc(0,0.016,0.082 mg/L) supplied in the nutrient solutions on wheat seedlings growth,zinc and phosphorus uptake,winter wheat plants of five genotypes were mix-cultured in Hoagland nutrient solution.Based on the biomass and the severity extent of Zn deficiency symptoms of five genotypes,S02-8 and Yuanfeng 998 was classified to susceptibility-types to Zn deficiency,and Zhongyu 6,Xiaoyan 22 and Xiza 1 were non-susceptibility types.Supplying Zn with low rate was more favorable for growth of wheat plants;Addition of CaCO3 with low rates could promote the development of wheat plants to some extent,whereas,addition with high rate inhibited the growth.The biomass of roots and shoots for wheat plants of susceptibility types were significantly lower than that of non-susceptibility types,and also the ratios of root to shoot of the former were obviously lower than that of the latter.Adding CaCO3 in the nutrient solution had little influence on Zn and phosphorus uptake by various wheat genotypes,but P/Zn ratios of shoot decreased with increasing CaCO3 additions.With increasing Zn rates Zn uptake by roots and shoots of wheat plants increased,but P/Zn ratios were decreased,and at the high rate of zinc supply Zn was easily accumulated in the roots,but at the same time P uptake was inhibited.In comparison with no supplying Zn,supplying Zn at high rate significantly decreased P/Zn ratios of roots and shoots of wheat plants,whereas,supplying Zn at low rate only slightly decreased the P/Zn ratios of shoots.All phosphorus concentrations of wheat plants of five genotypes tested were lower than the critical value of P toxication, therefore,it was no doubt that Zn deficiency symptom occurred had no relationship with P.Comparing with non-susceptibility type,the wheat plants of susceptibility types easily accumulated zinc in roots,P uptake was relatively low,and P/Zn ratio of shoot was higher. |
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