施氮量对幼龄胡椒根系生长及抽穗的影响

为探讨氮素营养对胡椒根系生长及花穗抽生的影响,以胡椒热引1号插条苗为试验材料,采用盆栽试验的方法,研究施氮量0、1、2、3、4 g/盆共5个处理对胡椒叶片SPAD值、干物质积累量、根系生长及花穗抽生情况的影响。结果表明:适量施氮可以增加胡椒叶片SPAD值和干物质累积,促进根系生长,总根长、总表面积、单位土壤体积的总根长、根体积均增加,花穗抽生较早且数量较多。但过量施氮会引起胡椒叶片SPAD值的降低,抑制干物质累积和根系生长发育,花穗抽生较晚,花穗数较少。因此,在本实验条件下,胡椒插条苗的适宜施氮量为1~2 g/盆。

Nitrogen Rate on Root Growth and Heading of Pepper

In order to evaluate the nitrogen (N) rate on root growth and heading of pepper,the experiment was conducted with five N treatments in pots.The five N treatments named N1,N2,N3,N4 and N5 were 0,1,2,3 and 4 g N per pot,respectively.The results showed that appropriate N rate increased SPA D reading,dry matter,root growth,and flower of pepper.Length,surface area,length per volume,and volume of pepper mot increased in appropriate N rate.Appropriate N rate promoted early flowering and more flower spike of popper.However,excessive N rate reduced SPAD reading,dry matter,mot growth,and flower of pepper.Length,surface area,length per volume,and volume of pepper root decreased in excessive N rate.And excessive N rate delayed flowering and reduced the flower spike.Therefore,the appropriate N rate is 1 to 2 g per pot of pepper in this container experiment.