共查询到20条相似文献,搜索用时 218 毫秒
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果尔(Goal)是一种活性高、杀草谱广,毒性较低的二苯类除草剂,为把果尔用于针叶树育苗除草,1987年在黑龙江省尚志县小九林场苗圃、穆棱林业局老道沟苗圃、迎春林业局中心苗圃进行了试验。一、试验概况试验树种:落叶松、红松、红皮云杉、樟子松。试验药剂:果尔23.5%乳油。 相似文献
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俞建英 《林业机械与木工设备》1983,(1)
FS—3型幼林抚育松土机是一种小型手扶式旋耕松土除草机械,它的工作头旋耕刀既是耕作部件,又是作业时的行走机构,由操作手通过手柄上提或下压支承脚尖杆,控制机组前进速度,使之低于刀轴回转线速度,从而实现旋耕松土除草。松土机刀片在除草松土过程中,由于切削、破碎机和抛掷土壤,产生土壤切削阻力。又由于耕深、耕速、土壤比阻、刀片 相似文献
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文章介绍了GCC技术在森林苗圃建设中的应用,包括坐标定位、设计元素测算、图形解析等。 相似文献
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全光照和75%遮荫作为裂区,微波辐射和IBA浸种采用L9(3^4)正交设计进行裂区下的正交试验,了解以上3因素对云南松苗木胚根和胚轴伸长的影响。结果表明,胚根和胚轴在全光照时的理论优水平组合分别为A2 B1和A1 B2;在75%遮荫时分别为A1 B1和A2 B2,仅胚轴在全光照时的理论优水平组合与实际试验结果相一致。全光照下微波辐射促进胚根伸长,而75%遮荫下其促进胚轴伸长。0.1 g/L的IBA浸种促进胚根和胚轴的伸长。 相似文献
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香榧苗圃地除草剂筛选试验 总被引:2,自引:0,他引:2
为提高香榧苗圃地杂草的防除效果,保护苗木,降低用工成本,选用普通市售除草剂,采用随机区组和正交设计筛选对香榧苗木无害且有效的除草荆单荆和组合.结果表明:(1)推荐剂量范围内不同除草剂对香榧苗圃地杂草都有一定的防除效果,药后第28天的株防效在57.46%~74.63%之间.果尔、百草枯的株防效较好,时效较长,可以选用;草甘膦的短时株防效最高,但时效短;精稳杀得起效较慢.(2)不同浓度除草剂混用后的除草效果比单剂好,药后第28天的株防效在84.32%~94.74%,筛选出的24%果尔乳油(1 050 mL/hm2)+10%草甘膦水剂(16 500 mL/hm2)+15%精稳杀得乳油(450 mL/hm2)复配剂除草效果最佳.(3)香榧苗圃地使用除草剂对苗木生长无影响,而且工效高,伤苗少,成本低,相对人工除草降低1 950 元/hm2以上. 相似文献
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文章通过分析长沙市国有园林苗圃存在的问题及当前发展的机遇,在国有园林苗圃由原有用地50hm2扩增至134hm2的情况下,在新苗圃的规划设计方面提出新的构思。 相似文献
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A decentralized seedling production is regarded as the most effective means of providing smallholders with planting materials. However, the sustainability of smallholder nursery operation is constrained by several factors, including the limited availability of germplasm, lack of technical skills and low seedling demand low viability of seedling market. The government nursery sector could complement the weaknesses of the smallholder nursery group but government nurseries are not operating effectively to enhance the availability of high quality seedlings of a wide species base for smallholder forestry. Seedling production in government nurseries is quantity-orientated with low emphasis on the production of high quality planting materials. Germplasm used in seedling production is mostly collected from unselected sources and seedlings produced are mostly of low physical quality. The species selection in government nurseries is heavily based on the availability of germplasm which resulted in the production of a few species which are commonly raised on private nurseries. The duplication of species of most seedlings raised in government nurseries with those produced in private nurseries and the far distance of government nurseries from the villages has resulted in low uptake of seedlings by smallholder tree farmers. For the government nursery sector to become more effective in providing support in the present paradigm of decentralized seeding production, a change from its production system and a broadening of the role it plays is needed. The social mobilization on seedling production as a scheme of implementing the Green Philippines Program has led the Department of Environment and Natural Resources to acknowledge the seedling production activity of private individual and communal nursery groups. This can be an opportunity for organizing the private and government nursery sectors to promote the operational effectiveness of the overall forest nursery industry. 相似文献
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为了探索干旱半干旱地区影响文冠果育苗的主导因素,采用正交试验设计,就播种期、种子等级、覆土厚度、基质类型、营养杯规格等因子对文冠果育苗的影响情况分别进行了大田育苗和容器育苗试验,并通过指标测定和数理统计分析优选出了影响文冠果育苗的主导因子及其处理水平。研究结果表明:影响文冠果育苗的主导因子分别是播种期、种子等级、覆土厚度、基质类型、营养杯规格;5月中旬播种、种子等级为Ⅰ级、覆土厚度为5 cm、基质为牛羊粪+本地土、营养杯规格越大的苗木其长势越好;土壤理化性质对文冠果育苗也有一定的影响,土层厚度与苗高、地径间均呈正相关,其相关系数均在0.95以上,土壤养分是苗木生长所需养分的重要来源,适于其苗木生长的土壤p H值在6.5~8.0之间。 相似文献