宁夏设施枇杷主要中微量元素苗期施肥优化

Optimization of Fertilization in Seedling Stage of Loquat in Facilities in Micronutrient of Ningxia

摘要: 为了明确宁夏设施枇杷苗期主要中微量元素Ga、Mg、Fe、Mn对苗期叶绿素增量的影响及最佳施肥区间，采用均匀设计法以二年生大营养袋枇杷实生苗为试材，应用回归和频数分析法对施肥前后叶绿素含量增量变化及因素效应进行了相关分析，建立了数学回归模型和相应施肥区间频率估计，结果表明：Ga、Fe、Mn单因素效应为正相关，Mg为负相关；Ga/Fe、Ga/Mn、Mg/Mn、Mg/Fe两因素互作效应为正相关，Ga/Mg、Mg/Fe为负相关；经频率分析后得到各主要中微量元素的最佳施用范围分别为：Ga为241.66~277.78mg/L，Mg为75.8~86.85 mg/L，Fe为25.14~29.63 mg/L，Mn为5.55~6.34 mg/L。

Abstract: In order to find out the effect of Ga, Mg, Fe and Mn on chlorophyll increment and the optimum fertilizing range of 2-year-old loquat seedlings in large nutrition bags in Ningxia Greenhouse, a uniform design method was used, and regression and frequency analysis were used to analyze the change of chlorophyll content increment and the effect of factors before and after fertilization. Mathematical regression model and interval frequency estimation were established. The results show that the single factor effect of Ga, Fe, Mn is positive correlation, Mg is negative correlation, the interaction effect of Ga/Fe, Ga/Mn, Mg/Mn, Mg/Fe is positive correlation, and the interaction effect of Ga/Mg, Mg/Fe is negative correlation. The results of frequency analysis showed that the optimum application ranges of micronutrients were as follows: Ga 241.66~277.78 mg/L, Mg 75.8~86.85 mg/L, Fe 25.14~19.63 mg/L, Mn 5.55~6.34 mg/L.