水稻冷浸田湿润栽培增产原因的研究   总被引：1，自引：0，他引：1  

段红平 《云南农业大学学报(自然科学版)》1994,9(2):105-111

 本文根据两年田间试验,探讨了冷浸田水稻在湿润栽培情况下土壤氧化还原电位、还原性物质总量、有机质和速效氮的动态变化规律,以及两个水稻品种在不同栽培情况下的吸氮状况。试验结果表明:冷浸田湿润栽培的增产原因在于改善土壤环境,土温升高,土壤昼夜温差加大,氧化还原电位提高,还原性物质总量减少,使土壤中潜在养分释放,特别是氮素释放最多,为稻根的营养吸收创造有利条件;稻根健壮,根系活力增强,地上部光合器官发达。  相似文献   

攀枝花印楝引种试验初报     

张奎  雷彻虹  谭中月 《四川农业大学学报》2007,25(3):282-287,293

通过试验表明,缅1和缅3种源在攀枝花干热河谷造林,次年保存率可达90%左右,月均树高生长量可达8.41~11.5 cm,地径生长量可达0.9~1.5 mm。印楝种子贮藏不宜超过3周,其发芽率可达80%以上。播种前经1%H2SO4溶液浸泡15 min或65℃温水浸泡30 min催芽,其发芽率可达90%以上。印楝适宜于攀枝花干热河谷海拔1500 m,尤其是海拔1300 m以下地区造林,以砾质红色石灰土最佳,山地碳酸盐红褐土次之,整地规格以种植穴长、宽、深60~80 cm为宜。  相似文献   

灰潮土田稻麦油轮作锌肥效应研究     

朱应远 《湖北农学院学报》1999,19(4):292-294,301

在江汉平原灰潮土田和利用其耕层土壤进行田间和盆栽试验，对水稻，小麦和油菜施用锌肥，结果表明：（１）３种作物施用锌肥增产效果显著，其中中稻和油菜的增产率比小麦的高，水稻的常规品种又比杂交品种的增产率高。（２）施用锌肥具有一定的后效作用；在水旱轮作中，锌肥以施在水稻上的为好；如果中稻和油菜轮作，两者都应施用锌肥；如果是中稻和小麦轮作，则可以只在水稻上施用锌肥。  相似文献   

稻谷储藏期间发芽率变化的研究   总被引：1，自引：0，他引：1  

谢维治  张奕群  杨雪花 《粮食储藏》2008,37(1):47-49

稻谷在高大平房仓储存期间,通过采取不同部位定点跟踪测定稻谷的发芽率,探索发芽率的变化规律,研究影响稻谷发芽率变化的因子,进而采用科学合理的措施,对于延缓稻谷的品质陈化,具有一定的实践指导意义.  相似文献   

水稻喷直播技术及其发展趋势     

袁成宇  张云竹  廖宇兰  朱冬云  罗洪峰 《农机化研究》2009,31(6)

在全面总结目前国内外水稻直播技术的基础上,对新型水稻直播技术-水稻喷直播技术的特点进行了简要叙述,对其相应的农艺技术要求进行了详细的剖析;同时,对影响该项技术推广应用所面临的不利因素进行了概括;最后,对该技术的推广前景以及发展趋势进行了初步探讨.  相似文献   

冬闲田单混播草地地上、地下生物量和总生物量动态及其相关性分析     

陈勇  龙伟  牛燕芬  陈功 《四川草原》2006,(12)

冬闲期,在云南省晋宁县对多花黑麦草与光叶紫花苕按不同比例混播的草地地上生物量、地下生物量和总生物量等指标进行了测定与相关分析,结果表明:多花黑麦草与光叶紫花苕混播(1.7 g/6m2+10.3 g/6m2)草地地上生物量可以达到13 534.28 kg/hm2,与其他处理差异不显著,粗蛋白产量达到2 589.27 kg/hm2,显著高于单播黑麦草(p<0.05)。草地地上生物量和总生物量随生长时间呈指数曲线变化,地下生物量随生长时间呈对数或幂函数曲线变化,并且地上生物量、地下生物量和总生物量三者之间具有显著的相关关系(p<0.01),地上生物量与总生物量之间表现出线性正相关,地下生物量与总生物量之间的相关曲线为指数或幂函数型,地下生物量与地上生物量之间也呈现出指数函数或幂函数关系。  相似文献   

水稻移栽田快杀稗混用试验研究     

许泳峰  朱迎春 《沈阳农业大学学报》1991,22(2):103-107

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Vegetation Composition and Succession of Abandoned Farmland: Effects of Ecological,Historical and Spatial Factors   总被引：6，自引：0，他引：6  

Karyne?BenjaminEmail author  Gérald?Domon  André?Bouchard 《Landscape Ecology》2005,20(6):627-647

In North America, as well as in Europe, the mechanization and the modernization of the agricultural activities had strongly modified the agricultural landscapes. Originating from these transformations of the agricultural environment, abandoned farmlands remain poorly known environments. A holistic approach, including the analysis of ecological, historical and spatial factors, is used in order to understand the dynamics of these environments created by agricultural abandonment in southwestern Québec (Canada). The analysis of 36 abandoned farmlands in the study area reveals the existence of two ecological groups. The first ecological group is composed by abandoned farmlands originating from pasture and at the moment dominated by a spiny shrub vegetation. The second ecological group includes past cultivated field at the moment dominated by either hydric herbaceous and shrub vegetation. Abiotic ecological variables such as slope, surface stoniness, canopy opening and soil pH, as well as land-use history, and age of the abandoned farmlands, are major factors explaining the current state of abandoned farmlands. Succession vector analysis reveals a strong differentiation among abandoned farmlands as to their tree species regeneration. Possible management alternatives, such as reforestation, are proposed in order to integrate those new environments to the modern agricultural landscape.  相似文献   

土壤水分状况和质地对稻田N₂O排放的影响   总被引：18，自引：0，他引：18  

徐华  邢光喜  蔡祖聪  鹤田治雄 《土壤学报》2000,37(4):499-515

1994年在中国科学院封丘生态试验站通过小区试验研究了土壤质地和水分状况对稻田N  相似文献   

The role of rice plants in regulating mechanisms of methane missions   总被引：7，自引：0，他引：7  

R. Wassmann  M. S. Aulakh 《Biology and Fertility of Soils》2000,31(1):20-29

 Rice plants play a pivotal role in different levels of the methane (CH₄) budget of rice fields. CH₄ production in rice fields largely depends on plant-borne material that can be either decaying tissue or root exudates. The quantity and quality of root exudates is affected by mechanical impedance, presence of toxic elements, nutrient deficiencies, water status of growing medium, and nitrogenase activity in the rhizosphere. CH₄ oxidation in rice fields is localized in the rhizosphere where the concentration gradients of CH₄ and oxygen overlap. CH₄ oxidation capacity is a function of the downward transport of oxygen through the aerenchyma, which, in turn, also acts as a conduit for CH₄ from the soil to the atmosphere. The decisive step in the passage of CH₄ through rice plant is the transition from root to stem. However, rice plants show an enormous variety of morphological and physiological properties, including differences in root exudation and gas transfer capacity. Comparative studies on different cultivars are deemed crucial for accomplishing a better understanding of the mechanisms of CH₄ consumption in the rhizosphere and CH₄ transport through the rice plant as well as the interaction of these processes. The results of such studies are considered tools for devising mitigation options. Received: 7 April 1999  相似文献