杏树的冬季修剪技术

来源 :烟台果树 | 被引量 : 0次 | 上传用户:ufo0101
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
一、幼树及初结果树的冬季修剪 幼龄及初结果期的杏树一般生长旺盛,树冠扩大迅速,新梢生长量大,并常抽生二三次枝。此期修剪应兼顾整形和结果两个方面。对主、 First, young trees and early fruiting trees in winter trimming Young and early fruiting trees generally grow vigorous, rapid expansion of the crown, the new shoot growth, and often pumping two or three times sticks. This period of trimming should take into account both the plastic and the results. On the Lord,
其他文献
亮丽身姿高反光的亮丽烤漆效果凸显出手机正面的晶莹剔透,小巧的Vodafone 火焰标志镶嵌其中,日系3G 手机夏普 V903SH 散发着独特魅力。背面则是另一派风格,仿皮表面不仅增加
  Nonlinear interactions dipolar, dipole-exchange, and purely exchange spin waves be tween themselves and with high-frequency electromagnetic pumping were stu
会议
  In this talk, we present the band gap formation and the existence of localized nonlin ear modes of the underlying nonlinear Schr(o)dinger equation (NLS) wit
会议
目的:评价磁控胶囊胃镜在心血管疾病患者中的有效性及安全性.方法:选取2019年4月至2019年11月于中国医学科学院阜外医院行磁控胶囊胃镜检查的心血管疾病患者240例,记录患者消
  Typically, studies of stability of lattice solitons consider this problem as a yes/no (i.e.stable/unstable) question.In this talk, I will first present a qu
会议
  Geophysical flows largely define the environment in which we live.A challenge for better understanding geophysical phenomena is due to multiscale variabilit
会议
  In this talk, I will present our recent work on the formation of discrete solitons and vortex gap solitons in optically induced periodic structures.I will d
会议
  The scalar nonlinear Helmholtz equation (NLH) models the propagation of intense laser beams in Kerrmedia such as water, silica and air.This semilinear ellip
会议
“津优3号”是天津市黄瓜研究所经过国家“九五”科技攻关,选育出的高抗霜霉病、白粉病、枯萎病,适合华北地区越冬温室及早春大棚栽培的黄瓜新品种。于1999年同时通过山西省
以下标准有助于结论正确性的判断。(1)研究方法及其论证强度:描述性研究论证力最弱,病例对照研究极易产生偏倚,前瞻性队列研究论证能力较强,而随机对照试验的论证力最强。(2