Effects Of Different Nutrition Condition On The Growth And Development Of Potato In Aeroponics

Potato is a crop harvested tuber, but the degradation, due to virus accumulation, restricted potato production. In order to solve the problem of potato degeneration on stream, people usually use rapid propagation technique of meristem tip virus-free to produce large numbers of minituber and all grade seed tuber. The key of use the virus-free technique is to get large numbers of minitubers by producing in substrate condition, in areoponics or in vitro, and so on, which all need manual work to provide nutrition solution. The providing manners of nutrition solution include leaves spill, roots spray and roots absorb nutrition solution from substrate or medium, within the absorption mechanism of nutrition and effect on tuber produce are also different. In order to study the difference, this research had been taken three factors split-plot trial design with three nutrition solution concentration steps, three nutrition manner and three varieties as control combination, to study the effect of different nutrition condition on the potato varieties tuberization capability and the nutrient absorb. The main results were as follows.1. The effect of different nutrition condition on potato tuberizing performanceThe results indicated that the MX and 0.8MX in concentration steps had a better effect than the disposal of 0.6MX concentration step in potato tuberization performance heightens. Three varieties' tuber amount was most and yield was highest in the disposal of 0.8MX concentration step (except Shepody), which was little higher than MX, but did not have significant difference between this two concentration steps. The mount and weight of tuber were mighty significant difference among different nutrition manner, the order of effect were foliar nutrition combines with root nutrition, root nutrition, foliar nutrition from large to small. The yield of different varieties was different in different nutrition condition. In all, the average yield of Shepody was highest in all disposal compounding. The best disposal compounding to potato tuber form were that MX concentration step combines both foliar nutrition and root nutrition, 0.8MX concentration step combines both foliar nutrition and root nutrition.2. The effect of different nutrition condition on potato' growth and developmentThe results indicated that the plants' growth was basically similar in different concentration steps disposal, the growth vigor of plants in MX and 0.8MX concentration steps was significant better than which in 0.6MX concentration step. In different nutrition manners, the plants' height, stems diameter, stems dry weight and LAI of only spilled foliar nutrition were smaller than other two manners, and much more significant after planted 27 days. Compared foliar nutrition combines with root nutrition to root nutrition, the growth vigor was basically similar in planted 27 days, and then appearance a few obvious difference, in the later of bearing period, the growth vigor of foliar nutrition combines with root nutrition was better than root nutrition. For different varieties, plants' growth vigor was also different, Shepody had a bigger stems diameter, height, chlorophyll content and LAI than Eshu-3 and Gaoyuan-7's, Eshu-3 had a bigger roots dry weight, roots activity, stems dry weight than Shepody and Gaoyuan-7's.3. The effect of different nutrition manners to absorb of NPKThe results indicated that in different nutrition manner, the plants' NPK absorption of foliar nutrition combines with root nutrition was more than other two manners, when stolon and tuber was beginning to form, especially after planted 27 days, the tuber was forming, the enhance effect was much more obviously, putted up mighty significant level. The absorption of NPK was significant reduced in the manner of only spilled foliar nutrition. The absorption rate of NPK gradually hoisted in the prophase, the max absorption rate was appeared in planted 37 days, and then gradually reduced. The absorption rate of NPK was a single apex curve; and the max absorption rate appeared in the day after planted 37 days. In the whole growth and development course, the demand amount of NPK were ceaseless increasing and absorption rate gradually hoisting within organ was forming, especially about in the day after planted 37 days, in this period, owing to hearty cell division and tuber swift form, tuber form fast and growth, and the absorption rate of NPK obviously height, through to the highest, then gradually drop off. In the whole growth period the order of NPK absorption rate from high to slow was N, P, and K. The distribution of NPK in each organ was changed along with the growth central transfer, the distribution rate of NPK in leaves was highest on initial stages then gradually drop; the distribution rate of NPK in tuber was hoiking after the tuber was forming. Finally the tuber distributed nearly 50% N, more than 60%P and nearly 60%K. The tuber was the finally organ of NPK' stockpile.