| Elephant-foot yam, Konjac has been from for-years herbaceous plant of Areaceae of monocotyledoeae and has been cultivated for a long time. It is not only the traditional food and medicine, Nowadays, but also is exploited and used widely in the modem food, medicine and chemical etc. Konjac with high-yield and high-profit becomes the important economical crops in the center-west region and has been formed and developed a comparatively independent and new-developing industry. However, because of unreasonable fertilization, it causes nutrition losing balance and seriously influences the yield and the equality. It is studying konjac physiological situation and improving the equality and yield that it is worth studying according to the control of nutrition. In order to this, this experiment using the same cultivated model ,two cultivars of konjac (white and flower konjac) has been used as materials multinomial physiological and biochemical indexes relating to konjac were determined separately under 8 different treatments of boron, including leaf area, the contents of Chlorophyll, Photosynthesis, activities of SOD, POD, MDA, PPO, the contents of dissolubility sugar, konjac glucomannan, protein, starch and yield. Thus studied the effects of growth, indexes of quality and yield of konjac under 8 different treatments of boron. The results achieved were as follow:The leaf areas have differences with the prolonging of time of growth in different boron concentration. See from the changes of leaf areas, the rising level of treat1, treat2, treat3, treat4, treat5, treat6, treat7, are same basically for white-konjac ,but treat7 is rising tremendously, and get to the height in two months and then be in decline. The size order of leaf area in every treat is: treat2>treat4>treat3>treat5> treat6>treat7>treat8>treat1. flower-konjac during 20-100 days after coming out, its leaf areas are all increase and get to the height. The order is: treat3>treat2>treat6>treat5>treat8>treat4>treat7>treat1. All these indicate that different boron concentration influenced the leaf area and rate of increase of white and flower konjac, the degree of effect is related to the high or low concentration closely. The increase of leaf area of konjac is best in the range from 0.25mg/L ~1.0mg/L. In this experiment, two cultivars have significantly differenceabout intent of Chlorophyll in different boron concentration. In the lack of boron, the leaf of konjac becomes thicker, color pales, contents of Ch1.a and Chl.b decrease, Photosynthesis leaf areas decrease, all these acts mutually caused Photosyn. rate's decline. Square-difference analysis indicated that there was significantly difference in variety, different treats and mutual action of variety * treat on contents of konjac's Chlorophyll. The optimum concentration is in the range from 0-1.0mg/L about contents of konjac's Chlorophyll and photosynthesis.There is significantly difference under the different boron concentration protct- ing enzyme of konjac tuber inner-membrane system. After exchanging head, the activities of POD, SOD are indecline, but the content of MDA and activities of PPO improve. Lacking or high boron ofconcentration destroy the integrality of membrane and raise the permeability, reinforce themembrane-fat peroxidization. So suitable boron concentration may improve the activities of POD, SOD and reduce the permeability. This shows suitable boron concentration has direct effects on the stability of membrane.Different boron concentration has effects on the quality of konjac and the effects embody in the changes of the contents of dissolubility sugar, konjac glucomannan, protein, starch . The changes of contents of konjac glucomannan are as same as that of fresh weight the seed of konjac tuber. Suitable boron concentration may expedite the transportation of carbohydrate and enhance the contents of dissolubility sugar and konjac glucomannan. Under the lacking or high concentration, the content of dissolubility of konjac tuber. The content of protein begins addi...
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