广西少数民族收割工具禾剪的考察与研究     

龚世扬 《南宁师范高等专科学校学报》2013,(2):31-34

禾剪,是广西少数民族使用的劳动工具,主要用来收割谷穗。通过研究,发现禾剪并不是原始和落后的代名词,其使用与广西少数民族种植的粮食作物、客观条件、文化传统有着密切的关系。  相似文献   

试论《失街亭》的艺术特色     

陈开梅 《青海师专学报》2001,21(1):17-19

《失街亭》的艺术特色主要表现在两个方面：人物塑造上，以言传神，以行绘人，相互对比，多方映衬，典型环境，适时夸张，情节结构上，自我首尾，相对独立，起落有致，扣人心弦，矛盾纵横，多姿多彩，具有强烈的艺术感染力。  相似文献   

水稻免耕栽培生理基础——Ⅱ.免耕水稻的光合特性     

李小林  王永锐 《中山大学学报论丛》1989,(5)

威优64、陆青早1号作为试验材料,免耕能提高功能叶的光合速率、生育前期功能叶的呼吸强度、绿叶面积、叶绿素和可溶性蛋白含量,并延缓它们在生育后期的下降速率,降低后期功能叶的呼吸速率。主分量分析说明,在研究光合作用时,光合强度、叶绿素、可溶性蛋白质、叶片含氮量,可以任意选择一个作为光合特性指际。粒/叶比说明,免耕对源的改善较对库的改善较好些。  相似文献   

A new approach to increase the attainable rice yield in intensive irrigated rice systems of Zhejiang province, China     

Wang Guang-huo  A. Dobermann  C. Witt  Fu Rong-xing  Sun Qing-zu 《浙江大学学报(A卷英文版)》2001,2(2):196-203

A new site-specific nutrient management approach was developed to break the apparent attainable yield barrier of 6 t·ha⁻¹ in the double rice cropping system of Zhejiang. On-farm experiments involving 21 rice-growing farmer families and NPK long-term experiments commenced in 1997 in the central part of Zhejiang Province to assess the status of soil fertility and productivity under intensive rice-rice cropping. A new site-specific nutrient management (SSNM) approach has been developed for this studied area. Field-specific fertilizer recommendations are calculated considering indigenous nutrient supply, reasonable grain yield targets and corresponding nutrient demand, nutrient balance and nutrient use efficiency, as well as socio-economic factors. The agronomic performance of SSNM was tested against the farmer's fertilizer practice (FFP) in four 1998–1999 cropping seasons. Across seasons and years, SSNM consistently increased plant nutrient uptake, grain yield and profit by about 10%–15% compared to the FFP. Yield levels of 7.5 t·ha⁻¹ or more seem achievable and sustainable through introduction of SSNM and improved extension services in Zhejiang Province. Project supported by the International Fertilizer Industry Association(IFA), the Potash and Phosphate Institute, Canada (PPIC), and International Potash Institute(IPI).  相似文献   

杂交水稻苗期生长与~(32)P~(14)C在分蘖的分布     

王永锐  陈坤朝  何文珊  邓政寰 《中山大学学报论丛》1989,(5)

用放射性同位素示踪技术,测定早、晚季10多个杂交水稻及其亲本中~(32)P、~(14)C在分蘖的分布(％),并统计其分蘖数量与~(32)P、~(14)C的相关性。结果表明,多数杂交水稻的分蘖数量与~(32)P在分蘖的分布(％)呈显著或极显著正相关,而与~(14)C也呈正的相关性;杂交水稻的生长势(苗高、苗重、根长、根重),普遍比亲本和“双桂36”好;光合强度和根的呼吸强度,除L301A×R29以外,其余均较高。还讨论了杂交水稻分蘖力,分蘖数量与谷粒产量的关系,以及~(32)P、~(14)C在分蘖分布(％)作为预测杂种优势的可能性。  相似文献   

嘉善县水稻土和稻米的硒含量状况及提高稻米硒水平的研究   总被引：7，自引：0，他引：7  

姚鼎汉  杨春雄  严强  李英  董振之 《科技通报》1992,(6)

对嘉善县水稻土和稻米的硒含量进行了分析.水稻土的有效态硒含量为9.52±2.26ppb,稻米硒平均为0.029±0.006ppm,普遍低于0.040ppm.提高稻米硒的田间试验表明,在水稻齐穗期喷施20ppm亚硒酸钠,可使稻米硒水平提高3～4倍,早、晚稻的稻米硒含量分别为0.197±0.149ppm和0.153±0.101ppm.  相似文献   

水氮互作对水稻茎叶中氮形态及部分无机元素含量的影响   总被引：4，自引：0，他引：4  

朱维琴  吴良欢  陶勤南 《科技通报》2004,20(1):1-5

采用聚乙二醇(PEG6000)模拟水稻干旱胁迫方法，研究了水氮逆境下不同品种水稻茎叶氮素形态及部分无机离子含量的变化．研究结果表明，干旱胁迫使水稻茎叶中可溶性蛋白(SP)、全P、Na^ 含量降低，而对水稻体内全氮(TN)、蛋白态氮(prN)、非蛋白态氮(NprN)及K^ 、Ca^2 、Mg^2 含量的影响因品种而异，且与供氮水平有关．干旱胁迫下，氮素营养可明显增加水稻茎叶可溶性蛋白(SP)、全氮(TN)、蛋白氮(prN)及非蛋白氮(NprN)、全P、K^ 、Na^ 含量，但对Ca2^2 及Mg^2 含量的影响具有品种间差异性。  相似文献   

广西水稻种业知识产权保护现状及发展对策     

陈玉冲  曾媛  张棵  黎丽菊  蒋显斌 《科技管理研究》2020,40(3):120-124

通过农业植物新品种、专利、地理标志等三方面分析广西水稻种业知识产权保护现状,发现广西水稻种业知识产权存在创造数量与质量不高、管理不够重视、运用效果不明显、保护效果待加强等问题。提出从六方面加强广西水稻种业知识产权保护,以促进广西水稻产业进一步发展:进行立体保护,全方位保护水稻种业知识产权;实行全程管理,提高知识产权保护与运用水平;提升专利质量,培育高价值核心专利;营造良好的知识产权保护与服务环境;加强农村知识产权教育,助力乡村振兴;以及加强种业"走出去"过程中的知识产权保护等。  相似文献   

Ultrabithorax is a key regulator for the dimorphism of wings,a main cause for the outbreak of planthoppers in rice     

Fangzhou Liu  Xiang Li  Muhua Zhao  Mengjian Guo  Kehong Han  Xinxin Dong  Jing Zhao  Wanlun Cai  Qifa Zhang  Hongxia Hua 《国家科学评论(英文版)》2020,7(7):1181

Rice planthoppers, the most devastating rice pests, occur in two wing forms: the short-wing form for rapid population growth and long-wing form for long-distance migration, which together create the mechanism for outbreak. Here we show that Ultrabithorax (Ubx) is a key regulator for switching between the long- and short-wing forms of rice planthoppers. Ubx is expressed in both forewing and hindwing pads, which is different from the canonical model of Ubx expression. In brown planthoppers, expression of Ubx (NlUbx) is regulated by nutritional status of the rice host. High-quality young plants induce NlUbx expression leading to the short-wing form; low-quality ripe plants reduce NlUbx expression resulting in long-wing form. We also showed that NlUbx is regulated by the insulin receptors NlInR1 and NlInR2. The default expression of NlInR1 inhibits NlUbx resulting in long-wings, while high-quality hosts induce NlInR2 expression, which represses NlInR1 thus promoting NlUbx expression to produce short-wings.  相似文献   

两系粳杂70优04高产制种技术     

刘平 《安徽科技学院学报》2000,(2)

通过对两系杂交粳稻 70优 0 4制种实施“父本栽插苗数”、“父母本栽插行比”、“生物激素使用”和“父本偏施氮肥”四项试验 ,明确了该组合制种父本适宜栽插苗数为穴栽 2粒种子苗 ,行比以 2∶1 2为宜 ,九二○最佳用量为 2 40 g/hm2 。分析了父本适当偏施氮肥应注意的问题  相似文献