"

im体育在线-官网欢迎您-im体育在线拥有全球最顶尖的原生APP,每天为您提供千场精彩体育赛事,im体育在线-官网欢迎您-im体育在线更有真人、彩票、电子老虎机、真人电子竞技游戏等多种娱乐方式选择,im体育在线-官网欢迎您-im体育在线让您尽享娱乐、赛事投注等,且无后顾之忧!

<var id="x7h5n"></var><menuitem id="x7h5n"><strike id="x7h5n"></strike></menuitem>
<cite id="x7h5n"><video id="x7h5n"></video></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"></cite>
<var id="x7h5n"></var>
<var id="x7h5n"><span id="x7h5n"><menuitem id="x7h5n"></menuitem></span></var>
<var id="x7h5n"></var>
<cite id="x7h5n"><span id="x7h5n"><var id="x7h5n"></var></span></cite><ins id="x7h5n"><span id="x7h5n"><var id="x7h5n"></var></span></ins><var id="x7h5n"></var>
<cite id="x7h5n"><video id="x7h5n"><menuitem id="x7h5n"></menuitem></video></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"><video id="x7h5n"><var id="x7h5n"></var></video></cite><cite id="x7h5n"><video id="x7h5n"></video></cite><cite id="x7h5n"></cite>
<var id="x7h5n"><video id="x7h5n"></video></var><cite id="x7h5n"><video id="x7h5n"></video></cite>
<var id="x7h5n"><video id="x7h5n"><menuitem id="x7h5n"></menuitem></video></var>
<var id="x7h5n"></var>
<cite id="x7h5n"></cite>
<var id="x7h5n"><strike id="x7h5n"><menuitem id="x7h5n"></menuitem></strike></var><var id="x7h5n"><span id="x7h5n"></span></var>
<cite id="x7h5n"><video id="x7h5n"><var id="x7h5n"></var></video></cite>
<cite id="x7h5n"><video id="x7h5n"></video></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"></cite>
<var id="x7h5n"><span id="x7h5n"></span></var>
<cite id="x7h5n"></cite>"
当前位置: 首页 > 其它果树 > 相关知识 > 正文

影响根系生长的因素

时间:08-10-18来源:网络 作者:佚名 收藏

 

      ①土层深度:土层越深,根系分布越深;苹果根系大部分分布在60厘米左右的土层中,一般好土层可达到80厘米左右。
      ②土壤松紧度:土壤疏松、孔隙度大,有利于根系向纵深发展,而土质坚硬,则不利根系生长。
      ③土壤肥力:主要指有机质含量的多少,一般要求2~3%以上。
      ④地下水位:地下水位应保持在1.5米以下。
      ⑤土壤含水量:一般土壤含水量达15~20%,根系能够正常生长。⑥土壤酸碱度:PH值在5.5~6.7的微酸性或中性的土壤或砂壤土。⑦土壤含盐量:含总盐量应低于0.28%。
      ⑧土壤温度:一般7~25℃,最适为13~26℃。
      ⑨土壤通气状况:通气良好,氧气含量在10~15%。

------分隔线----------------------------
im体育在线-官网欢迎您-im体育在线
<var id="x7h5n"></var><menuitem id="x7h5n"><strike id="x7h5n"></strike></menuitem>
<cite id="x7h5n"><video id="x7h5n"></video></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"></cite>
<var id="x7h5n"></var>
<var id="x7h5n"><span id="x7h5n"><menuitem id="x7h5n"></menuitem></span></var>
<var id="x7h5n"></var>
<cite id="x7h5n"><span id="x7h5n"><var id="x7h5n"></var></span></cite><ins id="x7h5n"><span id="x7h5n"><var id="x7h5n"></var></span></ins><var id="x7h5n"></var>
<cite id="x7h5n"><video id="x7h5n"><menuitem id="x7h5n"></menuitem></video></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"><video id="x7h5n"><var id="x7h5n"></var></video></cite><cite id="x7h5n"><video id="x7h5n"></video></cite><cite id="x7h5n"></cite>
<var id="x7h5n"><video id="x7h5n"></video></var><cite id="x7h5n"><video id="x7h5n"></video></cite>
<var id="x7h5n"><video id="x7h5n"><menuitem id="x7h5n"></menuitem></video></var>
<var id="x7h5n"></var>
<cite id="x7h5n"></cite>
<var id="x7h5n"><strike id="x7h5n"><menuitem id="x7h5n"></menuitem></strike></var><var id="x7h5n"><span id="x7h5n"></span></var>
<cite id="x7h5n"><video id="x7h5n"><var id="x7h5n"></var></video></cite>
<cite id="x7h5n"><video id="x7h5n"></video></cite>
<cite id="x7h5n"></cite>
<cite id="x7h5n"></cite>
<var id="x7h5n"><span id="x7h5n"></span></var>
<cite id="x7h5n"></cite>