1KF—35型果园开沟深施肥机的研制

介绍了1KF—35型果园开沟深施肥机的主要结构、工作原理、技术参数、机具设计的特点和关键技术及该机的生产试验情况。

几项技术对旱地小麦增产效应的研究初报

几项技术对旱地小麦增产效应的研究初报ＰｒｅｌｉｍｉｎａｒｙＳｔｕｄｉｅｓｏｎｔｈｅＥｆｆｅｃｔｏｆＩｎｃｒｅａｓｉｎｇＹｉｅｌｄｂｙａＦｅｗＴｅｃｈｎｉｑｕｅｆｏｒＷｈｅａｔｏｆＤｒｙＦａｒｍ杨成英，唐福玉，段红平（云南农业大学农业科学技术学院，昆明...

干旱地区植树造林技术装备的研究

阐述了国内外造林设备的发展及现状,分析了目前造林设备所存在的问题并对干旱地区的造林设备—开沟插干深栽植树机进行初步研究与探讨。

Stability of long trench in soft soils by bentonite-water slurry

A series of centrifuge model tests exploring the effects of different types of slurry on long-trench stability in soft clay were conducted. The influence of groundwater conditions relative to trench stability was examined by constructing long trenches using different slurries. The soil deformation and surface settlement induced by the excavation of the trench are found to be closely related to slurry type and excavation depth of the long trench. Increasing the bentonite concentration of the slurry has beneficial effects on stability: 1) larger particles can improve local and global stability in cases where filter cakes do not form, and 2) larger viscosity can promote filter cake formation on the walls of long trenches excavated in soft clay and enhance their stability.

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2BF-4型勺夹式精量播种施肥机的研究

老式播种机不能精量播种和大量深施复合肥,根据朝阳地区自然环境特点,研究了一种既能精量播种又能侧深施肥还能施口肥也能确保各个垄播种深度一致的播种机,本文介绍了该机的结构与工作原理,主要工作部件设计,参数和特点。