摘要
通过研究施用不同缓释肥量对豆梨(Pyrus calleryana Decne)容器苗生长和养分库构建的影响,揭示其对豆梨容器苗生长及其养分分配的规律,为豆梨容器苗培育的施肥技术提供依据。采用单因素随机区组设计,每m3基质中缓释肥施肥量设置4个水平,即F1(1.5 kg·m-3)、F2(2.0 kg·m-3)、F3(2.5 kg·m-3)、F4(3.0 kg·m-3),容器为无纺布袋(规格10 cm×14 cm)。结果表明:施肥量为2.0 kg·m-3时,豆梨容器苗苗高、地径生长量均达最大值,分别为48.23 cm、5.22 mm,同时具有最大的整株干质量,为6.56 g。施用缓释肥有利于提高豆梨容器苗养分库中氮积累量,2.0 kg·m-3(F2)施肥量时实现了氮养分库的最大积累量,整株氮积累量为136.86 mg·株-1。而缓释肥施肥量的增加对养分库磷积累量的提升不显著,施肥量1.5 kg·m-3(F1)已能满足磷素需求,此时根系表现出积极的磷吸收率,其积累量达2.75 mg·株-1。总之,从苗木生长和养分状况两方面考虑,F2(2.0 kg·m-3)施肥量时苗木生长表现最优,且满足豆梨1年生苗氮养分库的需求,而F1(1.5 kg·m-3)施肥量就能基本实现容器苗磷素养分加载。
We studied the features of its growth and construction of nutrient reserves under different levels of Slowrelease fertilizer(SRF)to show the rules of the growth and nutrient distribution of container seedlings for the fertilization techniques of Pyrus calleryana Decne.The experiment was designed as a univariate completely randomized blocks,and the amount of SRF was set with four levels:F1:1.5kg·m-1,F2:2kg·m-3,F3:2.5kg·m-3,and F4:3kg·m-3.The containers were nonwoven bags(10cm×14cm).When the level of SRF was 2.0kg·m-3 level,the container seedlings grew best.The maximum value of the height,diameter and the dry weight of whole plant were,respectively,48.23cm,5.22mm,6.56g.The application of SRF increased N content of nutrients reserves,and the largest nutrients reserves was constructed at 2.0kg·m-3,when N content of nutrients reserves of whole seedlings was 136.86mg per plant.While P content of seedlings was not changed by increasing SRF loading.F1(1.5kg·m-3)would be enough to provide P for constructions of nutrients reserves.At this time,the root system showed a positive uptake rate to P,and its content was 2.75mg per plant.Therefore,F2(2.0kg·m-3)level of SRF met N nutrients reserves needs of container seedlings,while F1(1.5kg·m-3)level could basically achieve the construction of P nutrient reserves.
作者
龚睿
沈永宝
史锋厚
Gong Rui;Shen Yongbao;Shi Fenghou(Nanjing Forestry University,Nanjing 210037,P.R.China)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2018年第3期40-44,共5页
Journal of Northeast Forestry University
基金
江苏省农业科技自主创新项目(CX(15)1031)
江苏高校优势学科建设工程(PAPD)
关键词
豆梨
容器苗
缓释肥
养分库
Pyrus calleryana Decne
Container seedlings
Slowrelease fertilizer
Nutrients reserves