Primary Study On Variation And Influenced Factor Of Rice Mineral Elements Content In Panxi Regions

The distribution of Fe, Zn, Cu, Mn, Ca and Mg in rice at mature stage; The dynamics change of Fe, Zn, Cu, Mn, Mg and Ca content during grain filling process; Fe, Zn, Cu, Mn, Ca and Mg six mineral elements content variation in rice of different varieties, types and different producing areas and factors of influence Fe, Zn, Cu, Mn, Ca and Mg content in rice were analyzed in this paper. The results were as followed:1. Fe, Zn, Cu and Mn four mineral elements content in yellow leaf was higher and the content of Ca and Mg was lower than correspondence element content in green leaf at mature stage. The content of the six mineral elements in yellow leaf was highest among yellow leaf, paddy and stem sheath. Fe, Zn, Cu, Mn, Ca and Mg six mineral elements content was obviously higher in rice chaff than correspondence element content in rice, that means there are abundant mineral nutrition in rice chaff and we made a lot of mineral nutrition lost during polished process.2. The content of Fe, Zn, Cu, Mn, Ca and Mg in rice decreased with the day after emergence .The dynamics change of Fe, Zn, Cu, Mn and Mg accumulation rate of rice after flowering were parabolical curve and could be described by logistic curve equation, However the accumulation rate of Ca in rice were double peak curve. There was extremely significant positive correlation between protein content and Fe, Zn, Cu, Mn, Ca and Mg content in rice during grain filling process.3. The mean content of the six mineral elements in rice was Mg>Ca> Zn>Mn>Cu>Fe. Variant coefficient of Fe content was the biggest, the second was Ca and the variant coefficient of Zn content was the lowest of rice among different rice varieties. The mean content of the six mineral elements in rice was japonica rice>indica rice >hybrid rice among different rice types.4. The difference in content of Fe, Zn, Cu, Mn, Ca and Mg six mineral elements in rice from various producing areas was obviously and the general trend was that the contentrice from various producing areas was obviously and the general trend was that the content of the six elements in rice from Yaan and Wengjiang was relatively higher and from Huili was relatively lower. Variant coefficient of Cu content was the biggest, the second was Fe and the variant coefficient of Zn content was the lowest of rice among different producing areas.5. Fe, Zn, Cu, Mn, Ca and Mg content of rice increased first and then decreased with the increasing application rate of N fertilizer. For Diantun502, content and yield of Fe, Zn, Cu, Mn, Ca and Mg of rice reached the highest level at N^and grain yield, highest atNigo-However, for Hexi 39, content of Fe, Zn, Cu, Mn, Ca and Mg of rice reached the highest level at Niso and grain yield, highest at N270. That means indica rice (Diantun 502) was more sensitive in response to fertilizer than japonica rice (Hexi 39). The supply of P fertilizer reduced the content and yield of Fe, Cu, Mn and Ca of rice, but adequate rate of supply of P fertilizer benefited in increasing content and yield of Mg. Properly supply of K fertilizer could increase content and yield of Fe, Zn, Cu and Mn of rice. For the two rice varieties, content of Fe, Zn, Cu and Mn of rice attained the highest level at K90, but supply of K fertilizer significantly decreased content and yield of Mg and Ca of rice.