水稻机插秧育秧基质研究进展   总被引：3，自引：0，他引：3       下载免费PDF全文

屈成  刘芬  方希林  邓跃军  张晶  王悦 《农学学报》2017,7(1):1-4

基质育秧是水稻机插秧的关键技术,育秧的好坏直接关系到水稻机插秧的质量和产量。为了给水稻机插秧技术的完善提供参考,本文综述了水稻机插秧基质育秧的现状、优点、类型;归纳了市场上常见基质的配方,对基质的物理性状、化学性状和生物性状等进行阐述;也指出了基质育秧存在的问题,并对其在今后农业生产上的应用进行了展望。  相似文献   

亚麻抗倒伏性状分析及培土对亚麻抗倒伏的影响   总被引：2，自引：0，他引：2  

陈双恩  杜汉强 《中国油料作物学报》2010,32(1):83

对亚麻抗倒伏机理及抗倒伏栽培技术研究表明:(1)采用倒伏指数能较好地反映亚麻抗倒伏能力,用倒伏程度能客观准确地评价亚麻倒伏的实际情况。(2)亚麻的抗倒伏能力与一级分枝长、一级分枝角度、单茎鲜重、冠层鲜重、冠层附着水量、倒伏指数、单株分茎数、根系鲜重,根系干重等性状呈负相关。与茎粗、茎秆抗折力、茎秆干重等性状呈正相关。(3)与倒伏程度关系最密切的几个性状中,茎秆抗折力对倒伏程度的直接作用最大,其次为茎粗和单茎鲜重。(4)快速生长期至现蕾期培土,可降低植株重心高度,使倒伏程度降低9.12%,比不培土的单株平均产量高16.21%,粒重增加2.68%,果粒数增加9.24%,单位面积产量高14.67%,而且差异达显著或极显著水平,但经济系数、株高、纤维的工艺长度等性状无明显变化,培土措施对抗倒伏能力差的品种效果较好,而对抗倒伏能力强的品种作用较小。  相似文献   

Micronutrient Distribution in Different Physiographic Units of the Siwalik Hills of the Semiarid Tract of Punjab,India     

B. D. Sharma  H. S. Jassal  J. S. Sawhney  P. S. Sidhu 《Arid Land Research and Management》2013,27(2):189-200

We investigated the profile distribution of total and diethylenetriamine pentaacetic acid ( DTPA )- extractable micronutrients ( Zn , Mn , Cu , Fe ) in soils developed on six physiographic units of the semiarid Siwalik hills of Punjab in northwest India . The soils showed a gradual fining of texture from shoulder slopes to toe slopes . All soils were alkaline and calcareous . In general , total and DTPA-extractable micro nutrients were higher in surface horizons and decreased in subsurface horizons . However , none of the micronutrients exhibited any consistent pattern of distribution with depth on different geomorphic surfaces . Physiography had a strong influence on the spatial distribution of total and available micronutrients . Contents of all micronutrients and their forms were higher in fine-textured and uneroded soils than in coarse-textured eroded soils . Soil pH , calcium carbonate , organic matter , and size fractions had strong influence on the distribution of total and extractable micronutrients . Based on linear coefficients of correlation , total content of micro nutrients increased with increase in clay content , whereas DTPA - extractable micronutrient content increased with increase in organic carbon and decreased with increase in pH and CaCO3 content . Except for Cu , no other micronutrient showed influence of total reserves on availability of the respective micronutrient . Among the various micronutrients , deficiency of Zn was found to be widespread , followed by Fe and Cu in the cultivated soils on foot slopes , toe slopes , and floodplains .  相似文献   

邢台唐山地震对河北平原土壤的影响   总被引：1，自引：0，他引：1  

杨思治  董俊祥 《河北农业大学学报》1990,13(2):83-87

对1966年的河北邢台大地震,1976年的唐山大地震的震中区的土壤情况进行调研表明:这两次强震,在烈度6度以上的震区,普遍引起地裂、地面升降、地表形变和喷砂冒水现象。喷砂冒水对该两地土壤的机械组成影响明显,凡经喷砂冒水、掺进砂粒后,耕层土壤质地级别均变动了一个级别;变化最大的是0.25—0.05mm和0.05—0.01mm这两个粒级。滨海区,强震冒出咸水,明显增加了地表土壤溶液的氯化钠含量。在经过多年的农耕区,目前已找不到当时强震对当地土壤类型(指土属、土种)影响的踪迹。  相似文献   

电热地板物理性能测试     

牟群英 《安徽农学通报》2007,13(5):165-166,107

本文通过试验对电热地板在运行过程中的温度、电流、电消耗功率进行了测试与分析.结果表明:在地板接通电源后的短时间内,电热膜的温度迅速上升,其电流和电消耗功率迅速下降;随着运行时间的延长,电热膜温度上升和电流、电消耗功率下降的速率减缓;当运行时间在40min以上后, 发热膜温度、电流、电消耗功率和地板表面的温度都达到并维持在一个稳定值附近;电热地板供暖具有安全、清洁、舒适、安装方便、节约能源等独特优点,是一种较为优越的供暖方式,具有较大的应用和发展前景.  相似文献   

混合遗产地的建筑分区控制及其设计原则——以风景名胜区为例     

宋峰 《水土保持研究》2005,12(4):30-32,45

以我国的混合类遗产——风景名胜区为例,提出了解决风景区中建筑与遗产保护的矛盾的技术途径:整体布局上保持合理的功能分区,构建了保护遗产、保护生态、体现自然美和地域文化等的风景名胜区建筑创作原则体系。  相似文献   

聚类分析在我国果树研究中的应用及问题分析   总被引：1，自引：0，他引：1  

聂继云  张红军  马智勇  杨振锋  李静 《果树学报》2000,17(2):128-130

对近１０年来聚类分析在我国果树研究中的应用情况进行了简要总结。涉及十余种果树及系统聚类和模糊聚类两种聚类分析方法。文中对有关问题进行了分析和讨论。  相似文献   

Effect of Nitrogen, Phosphorus Fertilization and Growth Regulators on Cotton Yield and Fiber Properties     

Z. M. Sawan 《Journal of Agronomy and Crop Science》1986,156(4):237-245

Two experiments were carried out at Giza Agric. Res. St., Agric. Res. Centre, Mins. of Agric., Egypt, during 1981 and 1982 seasons on cotton cultivar Giza 75 ( Gossypium barbadense L.), to investigate the influence of nitrogen rates (72, 144 or 216 kg N/ha), phosphorus rates (36 or 72 kg P₂O₅/ha) and three growth regulators, i.e. indole-3-acetic acid (IAA), indole-3-butyric acid (IBA) or 1 naphthalen acetic acid (NAA), each was sprayed with 10 ppm at three times 70, 85 and 100 days after sowing, on yield components, cotton yield and fiber properties. The design of the experiment was randomized complete blocks with four replications.
The data obtained showed that, the number of bolls/plant, boll weight, seed index, seed cotton yield/plant and seed cotton and lint yield/ha increased by increasing N rates and under the application of IAA, IBA or NAA. Lint index increased by applying the growth regulators, while it was not affected by N rates. Lint percentage decreased by raising N level, whereas it was not affected by the growth regulators. The number of bolls and seed cotton yield/plant, seed cotton and lint yield/ha increased, while the other yield components were not affected with the increase in the added P. In general, all the fiber properties tended to improve slightly by applying the three growth regulators.  相似文献   

四川不同城市园林土壤的性状分析   总被引：4，自引：1，他引：4  

尹幸福  陈修富  邓涤生 《四川林业科技》2004,25(1):50-54

城市园林绿化植物，为城市人营造了赏心悦目的社会环境和适宜人类自主性的文化娱乐空间，给都市人带来了生命的活力。城市园林植物的载体是土壤。摸清不同城市园林土壤的性状，可为适地适草、适地适树和科学合理地配置城市景观植物提供科学依据，推动城市绿化事业的发展。  相似文献   

康乃馨和月季天然红色素研究进展     

刘健君  林萍 《南方农业》2010,(1):42-44

对康乃馨和月季的天然红色素的研究进行综合阐述,总结康乃馨和月季天然红色素的主要物理化学性质、提取工艺及精制方法,为天然食用色素中的红色素开发利用提供理论依据。  相似文献