施用不同浓度的磷酸二氢钾对香椿生长及养分的影响

Effects of different concentrations of potassium dihydrogen phosphate on growth and nutrients in Toona sinensis

为了提高木本蔬菜香椿的产量和质量,以湖南省湘乡市湘之椿农作物有限公司的矮化香椿为试验材料,施用不同浓度的磷酸二氢钾(KH_2PO_4)叶面肥,然后对香椿地径、老叶长度、小叶长度、小叶数量及叶片中的可溶性蛋白质、可溶性糖、氮(N)、磷(P)、钾(K)等指标进行了测定与分析。结果表明:施用不同浓度的KH_2PO_4对香椿生长及营养成分促进作用明显,浓度在0.5%~1.5%之间的叶面肥处理均能显著提高香椿的地径、老叶长度、小叶长度和数量,各指标随施肥浓度的增加均呈先升后降的趋势,但当其浓度超过2.0%时,KH_2PO_4对香椿老叶生长有抑制作用;不同浓度的KH_2PO_4对于老叶叶片中的可溶性糖、可溶性蛋白、N、P、K含量的提高均有显著效果。综合分析认为,浓度为1.0%的KH_2PO_4对香椿老叶叶片营养成分含量的提升效果最佳;KH_2PO_4处理下的香椿叶片中的N、P、K均呈现出显著正相关,且彼此之间存在一定增效作用。

In order to improve yield and quality of Toona siensis, using dwarfism T. Sinensis produced by Xiangzhichun Crops Co. Ltd. as materials, different concentrations of potassium dihydrogen phosphate （KH2PO4） leaf fertilizer were applied, and ground diameter, old leaf length, length and number of leaflets, and contents of soluble protein and soluble sugar, N, P, K in T. sinensis＇ leaves were investigated and analyzed. The results indicated that different concentrations of KI-I2PO4 significantly affected growth and nutrients in T. sinensis. When the concentration was between 0.5% and 1.5%, KHIPO4 could significantly improve ground diameter, old leaf length, length and number of leaflets, and the indexes were increased and then decreased with fertilizer concentration increasing. KHzPO4 could inhibit growth of old leaves when concentration was over 2.0%. Different concentrations of KHzPO4 had significant effects on the contents of soluble sugar, soluble protein, N, P, and K in old leaves, and the optimal concentration was 1.0%. In the KH2PO4 treatments, the contents of N, P, and K in T. sinensis leaves had significantly positive correlation, and the indexes had a certain synergy between each other.