共查询到20条相似文献，搜索用时 203 毫秒
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晋城果园土壤肥力退化原因及平衡施肥方法 总被引：1，自引：0，他引：1
介绍了晋城市果园土壤养分及施肥状况，分析了土壤养分失衡、肥力退化的原因，提出了果园平衡施肥的具体指标和方法，及应重点注意的几个问题。 相似文献
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马尾松中龄林矿质养分与林木生长研究 总被引：2，自引：0，他引：2
通过对广西凭祥热带林业实验中心马尾松施肥试验林近１０年（１９８７－１９９５年）的养分动态监测结果表明：１．林地施肥常量化肥，对土壤养分全量无显著影响，施用尿素与氯化钾，分别能显著增加土壤速效氮和速效钾含量；２．施肥能显著增加针叶养分含量，这种影响施肥４年 明显；３．采用灰色关联分析技术，发现在该试验条件下，针叶含磷及土壤含量与马尾松生长关联度最大。 相似文献
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为了提高林地生产力，满足经济社会发展对杉木大径材的需求，采用不同抚育措施和测土配方平衡施肥技术，研究其对土壤养分变化和杉木胸径的影响。结果表明：间伐措施对土壤养分的影响不明显；测土施肥处理，与不施肥相比，有效促进了土壤碱解氮、有效磷、速效钾的积累，改善了土壤肥力水平。采取间伐施肥措施能显著增加杉木大径材胸径的生长，两年平均增加了3.43 cm，其中：平衡施肥带来的平均胸径增加量分别为1.03 cm；间伐带来的平均胸径增加量分别为2.4 cm。培育杉木大径材应实施间伐与测土施肥相结合的抚育措施。 相似文献
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施肥对毛竹笋材两用林土壤养分分布与肥力状况的影响 总被引：1，自引：0，他引：1
研究了三明市毛竹笋材两用林施肥前后土壤10项养分指标分布特性及施肥后土壤综合养分状况。结果表明:施肥后土壤养分指标变异系数为3.2%~76.5%,属弱变异至中等变异程度;除pH值、全磷含量偏斜量绝对值小于5%之外,其它养分指标分布发生不同程度偏斜。应用主成分分析法,取前3个主成分作为土壤养分的综合指标,土壤的有机质、碱解氮、全氮、速效钾首先反映出土壤养分状况,其次为有效磷,第3为pH值、交换性镁。14个试验处理的土壤养分水平差异较明显,试验处理N2P2K2、N1P2K1、N2P2K1的养分综合得分值最高,而缺素试验处理(N0P2K2、N2P0K2、N2P2K0)综合得分值分列第11、13、12位,说明氮、磷、钾肥的合理配比施肥可有效提高土壤养分综合水平。 相似文献
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Intercropping of immature rubber in Sri Lanka: present status and financial analysis of intercrops planted at three densities of banana 总被引：2，自引：0，他引：2
V. H. L. Rodrigo C. M. Stirling R. M. A. K. B. Naranpanawa P. H. M. U. Herath 《Agroforestry Systems》2001,51(1):35-48
Intercropping during the unproductive immature stage of rubber provides one means of addressing the gap in income suffered by smallholders after replanting or new planting of rubber. A survey of smallholder rubber plantations was undertaken to determine the current status of intercropping in Sri Lanka. A total of 587 smallholders were included in the survey that encompassed the four major rubber growing regions; Kalutura, Kegalle, Colombo and Rathnapura. Intercropping was practised on relatively few farms, with the percentage of smallholders engaged in intercropping ranging from 23 to 54%. Banana was the most common companion crop of rubber with a current extension recommendation for a single row of banana planted between rubber rows. A financial appraisal, based on data from an agronomic experiment, revealed the potential to raise profits by more than 350% if planting density of banana was increased threefold over current recommendations. Profitability of banana intercrops was governed by four major components; yield expected in the third year, fertiliser costs, labour costs and market value of banana fruit. The influence of planting density of banana on each component is discussed. The survey indicated that most farmers grew banana without chemical fertiliser. If high density banana intercropping is to be widely adopted as a means of raising income on immature rubber lands, then current recommendations for chemical inputs need to be addressed in order to bring initial costs down to a sustainable level for smallholders.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
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香蕉是重要的热带亚热带水果,本文综合相关文献资料,从香蕉的起源与分布和现代生物技术在香蕉种质资源的研究与应用等剖析香蕉种质资源研究和应用的现状。对香蕉起源与分布的认识是香蕉种质资源研究的基础,目前多数学者都承认香蕉起源东南亚,对演化路线却存在许多争议,现代分子生物技术为解决这一问题提供了机会;分子标记技术成为香蕉遗传多样性研究的重要工具,可以很方便地进行香蕉分类、亲缘关系及演化做较为精确的研究,甚至辅助育种的应用;组织培养、细胞悬浮体系和原生质体培养技术的不断成熟,促进香蕉种质创新的发展,使香蕉突变育种和转基因育种成为可能。 相似文献
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浅谈香蕉生产机械化管理 总被引：3，自引：1，他引：2
叙述香蕉生产机械化管理的内涵和在不同生长发育期的机械化设施和技术应用,提出香蕉生产机械化严重不足是严重限制我国香蕉产业发展的重要因素。 相似文献
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针对室外含笑树叶存在抖动及树叶间存在遮挡,导致含笑树叶点云数据不易重建与形变的问题。提出了一种含笑树叶重建与形变的方法,首先根据噪声特点和扫描线特性,对点云数据去噪;然后根据每条扫描线边缘点拟合出树叶的边缘,采用双三次广义张量积Bezier曲面拟合叶面,并结合三角剖分算法实现叶面的重建;最后采用基于非线性的有限元形变方法,模拟出真实的含笑树叶形变。实验结果表明,该算法简单高效。 相似文献
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霍山石斛组培丛生芽诱导增殖及生根技术 总被引：1，自引：0，他引：1
以霍山石斛无根试管苗为试材,研究了丛生芽诱导增殖和生根技术.丛生芽诱导增殖通过4因素3水平正交试验,筛选出的最适培养基为1/2MS 0.2 mg/LKT 0.2 mg/L NAA 0.3 mg/L 6-BA.4个因子对霍山石斛丛生芽诱导的影响顺序依次为:KT＞基本培养基＞6-BA＞NAA,其中,KT对霍山石斛丛生芽的诱导效果极为显著.添加不同浓度的生长素及香蕉泥进行生根诱导,其生根效果排序为:香蕉泥＞IBA＞NAA,最佳的生根培养基是MS基本培养基添加20%香蕉泥,生根率可达94.3%. 相似文献
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The development of the red palm weevil, Rhynchophorus ferrugineus (Olivier) was investigated on a newly developed semiartificial diet as compared with two natural diets namely sugarcane stem and banana fruit. The weevil was successfully maintained on these diets and duration of the life cycle for males and females, respectively were 164.97 and 194.61 days on the semiartificial diet, 192.5 and 186.5 days on banana, and 172.00 and 170.00 days on sugarcane. The average egg production per female was shown to be significantly higher on the semiartificial diet, being 184.00?±?18.68 eggs compared with an average of 125.00?±?11.97 and 133.00?±?15.21 eggs on banana and sugarcane, respectively. The fertility ranged between 94?–?100?% in those eggs deposited by females previously reared on the tested diets. The developed semiartificial diet was shown to be suitable for maintaining laboratory colonies of the red palm weevil, and it can substitute natural diets. 相似文献