Rules Of Absorption And Fertilizing Technique Of N, P, K In Taro

Taro also calls the YuNai, MaoYu, Yu, etc., and the ancient name called Dunchi. It is the Araceae perennial root herbaceous plants. Because of its sweet taste, rich nutrition, getting more and more favour of people, it is a common delicacy on the dining table. In recent years, with the development of benefit agriculture and agricultural planting structure adjustment, taro, as a kind of main aquatic vegetables planted. Taro’s growing, fertilizer requirement is big, and the fertilizer resistance is strong, but at present in most of the extensive cultivation management, and previous studies of taro more focused on the variety types of classification and the analysis of the nutrition ingredient, the study of taro cultivation theory and application technology, only a small number of reports, so there is the phenomenon of blind fertilizing in the production. Therefore, further study of nitrogen, phosphorus and potassium with influence on the yield and quality of taro, and then discusses the fertilizer requirement, can provide theoretical basis and technical support for taro fertilization.Field experiment of fertilizer effect of "3414" plan, this paper, based on the law of taro fertilizer, by adopting the combination of field trial and indoor chemical analysis method, studied the n, p, k with the influence of yield and quality of taro, and set up by applying n. p. k content as a variable factor, taro, the mathematical model of yield and qualityt as the objective function. The main results were as follows:(1)Differen periods of taro, sun taro on the absorption of nitrogen, phosphorus, potassium have different characteristics, but the change law is about the same. In seedling stage, the root, petiole, leaf growth, bulb has yet to begin development, the absorption of the fertilizer is less. Into the bulb expansion period, namely the mother taro began to enlargement, the absorption of NPK gradually rise, when the taro and sun taro germination, uptake, in tum, increases, when entering the bulb full ripeness period, nutrient fully into nutrient elements inside the bulb, into the mature period for mining.(2)Different nutrient combination treatment, significantly increase the yield and quality of taro than CK, processing between mother taro and taro, sun taro’s yield is significantly different.(3)Nitrogen and potash fertilizer can obviously affect the yield and quality of taro. and the effect of potash fertilizer is greater than nitrogen’s:The interaction effects between nitrogen fertilizer, phosphate fertilizer and potash fertilizer is relatively significant. In applying nitrogen (N). potassium (K) content of 447 kg/hm2 respectively and 192 kg/hm2, production gradually increase with the increase of fertilizer rate, applying more than the content, the output is reduced. Phosphate fertilizer used alone had little impact on yields, without obvious regularity. Under this experimental condition, with the fertilizer combination of N2P2K2, N2K2P3 andNsP3K2, i.e.300 kg/hm2 nitrogen+94 kg/hm2 phosphate+153 kg/hm2 potash,300 kg/hm2 nitrogen+141 kg/hm2 phosphate+153 kg/hm2 potash,450 kg/hm2 nitrogen+141 kg/hm2 phosphate+153 kg/hm2 potash, the taro output can reach more than 30000 kg/hm2. When using fertilizer combination N2P2K2, we can obtain the maximum yield,and the maximum output is 34597.4 kg/hm2.(4)Compared with the CK. The quality of taro corm all have varying degrees of increase. All kinds of the treatment of taro increase protein content (23.8%～76.3%), the son of taro increase protein content (4.8%～60.4%), sun taro increase protein content (2.9%～52.8%), higher fertilization for protein;Increase the soluble sugar content of each treatment of taro, taro son increase the soluble sugar content of up to 56%, sun taro increase the soluble sugar content of up to 16.9%; The treatment of taro increase vitamin C content (4.6%～39.4%), the son of taro increase vitamin C content (7.1%～38.6%), sun taro increase vitamin C content (3.2%～41.2%), fertilizer to increase vitamin C also more obvious; All kinds of the treatment of taro starch content increase (7.9%～33.4%), the son of taro starch content increase (5.2%～25.9%), sun taro starch content increase (1.4%～30.7%); The dry matter content increase of various processing of taro corm is not obvious.(5)Different nutrient fertilizer combination for taro’s processing economic benefits compared with the CK increase amplitude is large, the pure income growth rate is 15.08%～63.48%. Fertilization is conducive to agricultural high yield.