【摘 要】
：
柿树害虫的机械化防治柿树是河南省中北部山区、丘陵区的重要林业资源，是山区经济的支柱产业之一。近１０余年来，柿蒂虫、柿绒故、血斑叶蝉等柿树害虫猖撅发生危害，造成柿果大量减产
论文部分内容阅读
柿树害虫的机械化防治柿树是河南省中北部山区、丘陵区的重要林业资源，是山区经济的支柱产业之一。近１０余年来，柿蒂虫、柿绒故、血斑叶蝉等柿树害虫猖撅发生危害，造成柿果大量减产，甚至绝收。一些地区已经出现大量砍伐柿树，柿果、柿木生产出现危机。防治柿树害虫成...
Persimmon tree persimmon control of persimmon persimmon is a mountainous area in central and northern Henan Province, hilly areas of important forestry resources, mountain economy is one of the pillar industries. In the past 10 years, the persimmon pests, such as persimmon, persimmon, persimmon and so on, have caused damaging rampages, causing a large number of persimmon fruits to cut down or even failing. In some areas, a large number of persimmon trees have been cut down, and the production of persimmon fruits and persimmon trees has shown a crisis. Control persimmon pests into ...
其他文献
An algorithm for precise satellite clock offset estimation based on GPS with the GPS Toolkit (GPSTk) has been developed.Using International GPS Service (IGS) pr
To overcome the high computational complexity of the existing joint tracking and classification (JTC) algorithm,particle filter (PF) is introduced to replace nu
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
提高苹果苗木栽植成活率的几点措施（１）最好栽植一级苗，即苗高１．５ｍ左右，地径０．８ｃｍ以上，根系不劈、不裂，并有５条以上２０ｃｍ长的很。（２）苗木定植前将劈裂的根尖剪掉，然后用清水泡一昼夜，尤其是长途运输的苗木
苹果园花期放蜂李岩（山东省果树研究所泰安２７１０００）苹果除国光等个别品种有自花结实能力外，绝大多数品种自花结实率不足１０％，三倍体品种（乔纳金、北斗等）自花结实率为零；因此苹果在建园时应注意
Based on the auto-collimation theory,auto collimator is a highly-precise measuring equipment used for small-angle measurement.In this paper,we do some research
Compared with traditional aircraft,the near space hypersonic aircraft control system has a very prominent strong coupling,strong nonlinear,time-varying dynamics
■柑成熟期应注意防治“蒂枯”我局柑国在１９９１～１９９２年连续两年因“蒂枯”在九月下旬十月上旬造成大量落果，严重影响产量。柑由于果梗细长，在果实生长中后期，容易受炭疽病病菌侵染，使靠近果
ＯｎｔｈｅＥｓｔａｂｌｉｓｈｍｅｎｔｏｆａｎＥｆｆｅｃｔｉｖｅＦｉｎａｎｃｉｎｇ ＳｙｓｔｅｍｆｏｒＨｏｕｓｉｎｇ（ＴｈｅＲｅｓｅａｒｃｈＧｒｏｕｐｏｎＨｏｕｓｉｎｇＲｅｆｏｒｍ．ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｏｃｉａｌＳｃｉｅｎｃｅｓ）Ｓｉｎｃ...
OntheEstablishmentofanEffectiveFinancingSystemforHousing (TheResearchGrouponHousingReform.ChineseAcademyofSocialSciences) Sin
文章给出了一种依靠气动力实现大气制动轨道近心点高度控制的方法,并设计了相关倾侧角控制律.通过调整气动力在高度方向上的分量来实现对近心点高度的控制,并根据实际飞行的