Studies On Differences In Potassium Nutrition Between Two Super-high Yield Wheat Varieties

This thesis studied the abilities of absorbed K, K use efficiency and the relation of K to wheat pattern characters, physiological property and quality character between two super-high yield wheat varieties in chao-soil. The initial research results showed:1. There were differences in aspects of K content, the dressing K effect, K use efficiency, abilities of utilizing K in soil and K efficiency etc. between two super-high yield wheat varieties. Wenmai-6 was a low-K tolerance and high K efficiency genotype variety.2. There were obvious positive effect among KU N^ P, and low-K tolerance breed of wheat could promote the absorbed effect and it much more distinct between N and K which guaranteed the nutrition need of plant high product in some extent.3. Whether the absorbed K could be reused or not or the extend of its reuse in the plant body decided the36 fertilizer's devise strategies in produce. This trial research built a method which used the ratio of K content between the wheat opened leaf and matured leaf to decide K move feature in the plant, and it also announced that in the same breed of wheat K shift ability had something to do with K nutrition level and plant genotype. In low-K level the ratio between opened leaf and matured leaf of the same breed was higher, which illustrated that K move ability in the wheat plant were advanced. With the promote of provided-K level, the ratio decreased. K move ability weakened.4. The SOD content was different in the bodies of two super-high yield wheat varieties. With the change of external offered K conditions, their changing ranges were not identical. Wenmai-6 showed the SOD activity was more stable. That explained the produced active oxygen in its body was low relatively. However, the SOD activity of Lankao 906-4 was reduced significantly, so the leaf was liable to be harmed by active oxygen. The photosynthesis rate of flag leaf of Wenmai-6 was less affected by external offered K factors. It explained that its photosynthesis rate was stable to promote the form of yield.5. The last display of absorbed K abilities of two super-high yield wheat varieties was to form yield. The field trial showed the effect of yield rise of wenmai-6 was betterthan Lankao 906-4 under the same offered K level. And Wenmai-6 realized the object of super-high yield. It showed K effect of Wenmai-6 was prior to Lankao 906-4.6. K not only advanced the rise of wheat quality but also affected the component of quality, too. K had the different influence to trial two super-high yield varieties. As for as wheat processed quality connected, Wenrnai-6 was prior to Lankao 906-4.