超高产水稻产量形成的气候生态特点研究   总被引：11，自引：1，他引：10  

刘军  余铁桥 《湖南农业大学学报(自然科学版)》1996,22(4):326-332

在云南和湖南异地异季种植，研究了水稻超高产形成的相应气候生态条件，结果表明：超高产水稻具有大穗、多穗、高结实率的特点．云南试区具有日较差大、日照时数多、相对湿度低，平均温度较低的气候特点，故水稻生育期较长，同化物积累多，成穗率高，灌浆强度大．湖南试区阴雨寡照是影响产量的重要因素．  相似文献   

纤维素酶对兔日增重、肠绒毛结构、胃内容物及肝、睾丸内无机元素含量的影响   总被引：2，自引：0，他引：2  

尹清强  陈侠甫  王景林  杜洪识 《黑龙江畜牧兽医》1992,(1)

选用雄性日本大耳白兔20只,随机分为试验组和对照组,每组10只。结果表明,饲喂纤维素酶(3g/头·日)的兔日增重明显增加(P<0.05),通过电镜观察试验组兔空肠肠绒毛结构比较完整,而对照组则比较紊乱。另外,纤维素酶还能提高兔胃酸度和胃蛋白酶的活力(P<0.01);使肝脏中Cu(P<0.01)及睾丸内无机元素的含量增加,而使肝脏中Mn的含量下降(P<0.01)。  相似文献   

水稻机械化喷直播技术的应用现状及对策     

黄宗飞  叶钊海 《中国农机化》2005,(1):35-36

分析了水稻机械化喷直播技术的特点和技术要求，介绍了水稻机械化喷直播技术的应用现状及其技术推广的制约因素．提出了推广水稻机械化喷直播技术的对策．  相似文献   

Weeding techniques in transplanted and direct wet-seeded rice in Pakistan     

MOHAMMAD SAFDAR BALOCH  GUL HASSAN  TETSUO MORIMOTO 《Weed Biology and Management》2005,5(4):190-196

Field studies were undertaken to explore the weed management strategies for transplanted and direct wet-seeded rice in the Dera Ismail Khan district of North-west Frontier Province, Pakistan. The experimental design was a randomized complete block with a split plot arrangement. The main plots consisted of two planting techniques (transplantation and direct seeding), while weed control practises assigned to the subplots included the use of the granular herbicide Sunstar 15WG (ethoxy sulfuron), Machete 60EC (butachlor), conventional hand weeding, and the weedy check (untreated control). Data were recorded on weed dynamics and the agronomic parameters of the rice crop. Economic analyses on the data were also run. The weed density and biomass were lower in the transplantation plots than the direct-seeding plots. The herbicides ethoxy sulfuron and butachlor reduced the density over the weedy check, with a density comparable to hand weeding in 2002, but slightly higher in 2003. As a result of weed management by hand weeding and herbicides, the paddy yield and its components were significantly higher for the transplanted method compared to the direct-seeded method. The comparable yield of herbicides with hand weeding offers an option for the use of herbicides as an alternative management tool. In light of our findings, it is concluded that for good economic returns, rice crops may be transplanted rather than direct-seeded. The herbicides ethoxy sulfuron and butachlor offer a weed control cover comparable with hand weeding under the transplantation method, while butachlor is good for controlling weeds even under the direct-seeded conditions in the agroclimatic conditions of the area.  相似文献   

Alternative Route of Infection for Bacterial Seedling Blight of Rice Caused by Burkholderia plantarii     

Hisayoshi MIYAGAWA  Hiroyoshi INOUE 《Journal of General Plant Pathology》2002,68(4):356-362

Burkholderia plantarii , the pathogen of bacterial seedling blight of rice, was detected in paddy water. Its concentration rose in July and August. The bacterial concentration in the paddy water was always higher along levees than at distances more than 5 m from levees. Confirmed to be released into water when graminaceous weeds were immersed, B. plantarii survived for at least 4 days at 30°C. B. plantarii was splashed at least 30 cm upward by rain splash in the field. Harvested seeds, which had been sprayed with B. plantarii released from graminaceous weeds at the flowering stage, retained the bacteria. Bacterial seedling blight occurred when the seeds were then sown in nursery boxes. These results indicated that graminaceous weeds growing on levees of paddy fields are a source of infection of the disease and that rice seeds are infected through the paddy water. Received 23 May 2002/ Accepted in revised form 1 September 2002  相似文献   

Effects of soil moisture conditions on the emergence of weeds and rice plants from rainfed paddy soils in north‐east Thailand     

HIROHIKO MORITA  NOBUYUKI KABAKI 《Weed Biology and Management》2002,2(4):209-212

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稻水象甲发生规律与药剂试验方法的探讨   总被引：4，自引：0，他引：4  

朱世宏  王红旗  田新  解文强  董玉武  邱世栋  安玉云 《农药科学与管理》2003,24(7):15-17

稻水象甲是国际检疫对象，已经是我国北方水稻产区最重要害虫之一，并且呈迅速蔓延之势。此虫主要借助交通工具作远距离传播。成虫危害叶片，幼虫危害根系。一年繁殖一代但有两个危害高峰。新农药田间药效试验如果针对防治成虫、幼虫或者兼治，应在相应的时间、采取不同的方法进行。  相似文献   

南方灭鼠应用稻谷与大米毒饵的比较          下载免费PDF全文

张美文  王勇  李波  陈安国 《植物保护学报》2003,30(1):86-90

生物测定法测得谷壳对复方88-1灭鼠剂的阻滞率为54．3％，光谱分析法测得其对敌鼠钠盐的阻滞率在47．43％—57．00％之间。相同条件下，褐家鼠Rattus norvegicus取食敌鼠钠盐稻谷毒饵量为大米毒饵的2倍多。在南方潮湿的环境下，大米毒饵更易松散、霉变，使其适口性更低。综合考虑认为南方灭鼠使用稻谷毒饵更为合适。  相似文献   

双季稻区稻水象甲的生物学特性研究   总被引：5，自引：0，他引：5  

林云彪  商晗武  吕劳富  李先南  顾云琴  黄贤华  董向阳 《植物保护》1997,23(6):8-11

稻水象甲在浙江双季稻区每年发生２代，以成虫滞育越冬。春季越冬成虫迁入早稻田繁殖，形成１代致害种群；夏季１代成虫生殖滞育，绝大部分个体（９５％以上）迁出早稻田行夏蛰并越冬；秋季２代成虫羽化后，大部分迁飞山上草地越冬。  相似文献   

蚕粪中提取叶绿素铜钠盐的稳定性研究   总被引：10，自引：3，他引：10  

胡军华  张袁松  李鸿筠  姚廷山  刘浩强  雷慧德  陆红霞 《蚕业科学》2005,31(3):370-373

以蚕粪为原料,95%的乙醇为溶剂提取叶绿素,并通过化学法制得叶绿素的铜纳盐。采用721分光光度计对叶绿素铜钠盐进行定性、定量测定,确定该色素测定系统中的最大波长为414nm。通过测量吸光值研究了几种常用食品添加剂对叶绿素铜钠盐稳定性的影响,并对其耐光、耐热、耐酸碱及耐氧化性、耐还原性进行探讨。结果表明:叶绿素铜钠盐在70℃以下稳定性较好;光照对叶绿素铜钠盐稳定性的影响较大;还原剂(Na2S2O3)对叶绿素铜钠盐稳定性的影响较大,氧化剂在短时间内对其稳定性的影响不大,但放置的时间不宜超过30min;叶绿素铜钠盐在pH值为6以上的溶液中较为稳定,且有机酸及单糖对其稳定性无明显影响。  相似文献