不同氮素形态配比对越橘生长、产量及叶片元素含量的影响

Effect of Nitrogen Form Ratios on the Growth,Yield and Leaf Element Content of Blueberry

对栽培的5年生高丛越橘"蓝丰"施入不同氮素形态配比的氮肥,研究结果表明:NH4+-N/NO3--N为5∶1和4∶2处理的越橘植株延长枝净生长量、基生枝长度、基生枝数量及叶面积均增加,其延长枝净生长量分别为4.55,4.30cm,基生枝长72.20,70.20cm,极显著高于对照。不同氮素形态配比的氮肥增加越橘的产量,NH4+-N/NO3--N为4∶2处理株产量最高,为779.31g,比对照增加9.4%。叶分析结果表明,在NH4+-N中加入适当比例NO3--N,可提高叶片中N、P、Fe、Mg含量,但Ca的含量下降。

Five-year-old ‘Bluecrop＇ highbush blueberry was selected and different nitrogen form ratios of fertilizer were applied in soil. The result indicated that NH4^＋- N/NO3^ - - N = 5 ： 1 and 4 ： 2 treatment increased shoot length, ground shoot length, number of ground shoot and area of leaf. Shoot length of those 2 treatments was 4.55 cm and 4.30 cm respectively and ground shoot length was 72.20 cm and 70.20 cm respectively, significantly higher than those of the control. The yield of fruit was also increased by applying different nitrogen form ratios of fertilizer. The yield of NH4^＋ - N/NO3^- - N=4：2 treatment reached the highest, 779.31 g/plant, 9.4% higher than that of the control. Leaf analysis showed that leaf N, P, Fe and Mg content was increased but leaf Ca content was decreased by NH4^＋ - N appliedd ratio of NO3^- - N.