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我们苗圃从1984年开始,连续两年对沙棘育苗应用40％除草醚乳粉进行除草试验,取得了明显效果。一、用除草醚除草的好处 1、用除草醚除草,每亩用1公斤,合款3.50元。可省人工8～10个,工资费9.30～12.50元。 2、用除草醚除草,大部分妨害苗木生长的草如稗草、碱灰菜等都能被杀死,比人工除草工效提 相似文献
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我们用25%的可湿性粉剂除草醚,进行苗圃除草.使用方法:在各苗龄苗木的生长期或发芽前期使用,有喷粉、喷雾、毒土三种.几年来,使用除草醚防除苗圃地内杂草的结果,除草效果在70—90%左右.1年施用1—2次,可基本上不用人工除草.平均每亩可节省劳动工日80个以上,节省开支248.80元.经过测定和观察,施用除草醚的苗床上,有20—30%的苗木出现第二次高生长.云杉新播苗高生长增长0.5—1厘米,云杉移床苗高生长增加2厘米, 相似文献
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化学除草技术在林业苗圃中的推广应用试验初报 总被引：1，自引：0，他引：1
试验探讨了在杉木、马尾松、柳杉和火炬松育苗过程中化学除草技术的应用,分析了果尔、氟乐灵、除草醚和扑草净的除草效果,结果表明:(1)果尔、氟乐灵和除草醚除草效果较好;(2)育苗中,在芽前和苗期两次应用果尔、氟乐灵或除草醚处理,即可基本不需要安排人工除草;(3)化学除草可节省除草用工的80%—90%,降低除草成本的80%—86%;(4)除草剂基本不影响苗木生长。 相似文献
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在马尾松大田育苗中，比较果尔、氟乐灵和除草醚的除草效果。其结果：3种除草剂都能有效杀除杂草，其中果尔和氟乐灵除草率达到85％；3种除草剂对苗木生长没有不良影响。采用化学除草可以节省育苗的除草成本80％。 相似文献
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采用果尔、除草醚和扑草净三种除草剂分别对落叶松、樟子松和云杉当年播种育苗进行化学除草对比试验,试验共分三次进行,其中出苗前一次、苗期两次,每次设30个样方,5个重复.试验结果表明,出苗前用药效果最好,灭草率果尔为97.6％、除草醚为92.6％、扑草净为94％;苗期两次试验的除草效果分别为:果尔93.6％和89％、除草醚86.3％和83.2％、扑草净91.4％和86.7％;采用化学除草与采用人工除草相比,可分别降低成本81.5％、76.7％和79.7％. 相似文献
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松树育苗,除草靠手工操作,花劳力很多,时间要占据整个育苗时期的三分之一,如遇连续阴雨,劳力紧张,稍有疏忽,松苗就会被杂草淹没,以致影响松苗生长.为了消除草害,我们从1978年起,用化学除草剂进行除草试验.在实践中摸索了一些经验.现介绍如下:一、除草剂品种和用药量:扑草净和除草醚混合使用,每亩每次用50%扑草净可湿性粉剂5两加20%除草醚1市斤(如用40%除草醚则用半市斤),兑水100—150斤喷雾,或用细土40—50斤撒施. 相似文献
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除草剂在油松育苗中的应用试验 总被引：1，自引：0，他引：1
在油松育苗中应用除草剂灭草效果明显,当苗木出土6～8周以后,用除草醚（1．1g·m^-2）、拿捕净（0．05mL·m^-2）＋果尔（0．05mL·m^-2）、除草醚（0．55g·m^-2）＋果尔（0．05mL·m^-2）分别进行土壤喷施处理,除草率达到96．8％、98％、99％。一定剂量的除草剂混用可增加有效期和除草率。施用除草剂对苗木不同时期生长无影响,且较为经济,每年可节约除草费用900～1200元·hm^-2。 相似文献
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在干旱多风地区，将２ａ生樟子松苗继续留床１ａ，不浇水，不施肥，后期不除草，冬季不起苗，翌年可使造林成活率提高３０％以上。 相似文献
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The regions of the world using operational seedling testing to any significant extent are Canada, Britain, Sweden, and the Pacific Northwest region of the United States. Testing has been used operationally for batch culling (to ensure quality), as well as for research into improved nursery cultural practices. Savings from testing for seedling survival are substantial. However, growth gains from operational testing are more tenuous. Reduced rotation lengths and lower weeding costs are more likely to be associated with planting larger stock, rather than planting stock with higher physiological quality.Large opportunities for savings exist for regions and organizations that produce poor quality stock, have high planting costs, or both. New tests have been developed and some are becoming operational. New tests might be more effective than existing tests. However, in the regions most involved in seedling testing, plantation survival has increased over the last ten years. Subsequently, additional investments in operational testing will likely achieve diminishing returns. 相似文献
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Oaks are not sustainable in many upland temperate forests because of poor recruitment resulting from natural regeneration. Artificial regeneration is an alternative to natural regeneration, but is difficult, in part, due to large variation in seedling quality. In this study, we examined the effects of acorn size and mass on nursery seedling morphological parameters commonly used to quantify seedling quality, and we determined if genetic factors affected these relationships. Acorns were collected from six open-pollinated orchard trees (i.e., six half-sib families), and were separated into six size classes based on acorn diameter (ranging from 1.3 to 2.5 cm). Samples from each size class were weighed for total fresh mass. Acorns were sown in a commercial bareroot nursery in Polk County, Tennessee, USA, and seedlings were grown for 1 year using nursery protocols to maximize growth. Seedling survival was generally not affected by acorn size class or mass, except one family had higher survival in the larger acorn size classes. Five of the six families had no discernable relationship between acorn size class and seedling size. Acorn mass was positively related to seedling morphology, but relationships were weak (R2?≤?0.11) and biologically insignificant. Neither acorn size nor mass could be used reliably to predict seedling survival or morphological indicators of seedling quality. We hypothesized that results were affected by an unusually long growing season and advanced fertilization regimes at the nursery, which may have negated acorn size/mass effects on seedling growth. Family affected relationships between acorn size/mass and seedling morphology, indicating that family selections could improve overall seedling quality. 相似文献
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本项研究在总结传统育苗的基础上，应用推广了苗木生长调控新技术，新老技术紧密结合配套使用，取得了松树大田育苗的良好效果。通过选择圃地、控制播种量、精耕细作、科学管理，并在苗木旺盛生长期的8月中旬进行切根、剪顶，有效地促进了苗木生长发育。结果表明，马尾松播种量45kg／hm2，培育苗木169．2万株，Ⅰ、Ⅱ、Ⅲ级合格苗出圊率时％，其中优质苗率达53．5％。苗木茎干粗壮、根系发达、菌根丰富，达到了大田优质苗的质量标准。 相似文献