亚热带水产养殖寒灾预警系统的设计与实现     

涂超 《安徽农业科学》2011,(17):10694-10696

通过对亚热带水产养殖现状的分析，论述了亚热带水产养殖寒灾预警系统建设的必要性、研究的目标和任务，详细介绍了系统的结构和框架，以及亚热带水产养殖寒灾预警的几个关键问题及其解决方法。  相似文献   

提高大石早生李坐果率试验研究   总被引：4，自引：2，他引：2  

杨建民  管金萍  曹会军 《河北林果研究》1999,14(4):323-325

为提高大石早生李初果期坐果率,于盛花期进行人工授粉、环剥和环割、喷施激素和微肥试验。结果表明:选择盖县大李和香蕉李作授粉树,盛花期对主干进行环剥、喷施30×10-6赤霉素、100×10-6氯化稀土、03%硼砂+03%尿素,均能显著提高大石早生李坐果率。  相似文献   

Freeze testing and field mortality of Pinus sylvestris (L.) in northern Sweden     

《Scandinavian Journal of Forest Research》2012,27(1-4):205-218

Six short‐term freezing experiments were carried out on 24 one‐year‐old single‐tree open pollinated families of Pinus sylvestris (L.) representing four populations in northerly Sweden (latitude 62°10'N to 66°50'N). Two experiments were conducted in a climate chamber, two in a greenhouse and two outdoors. For freeze testing the plants were exposed to ‐10°C for three hours in a freezing chamber. A freezing experiment in a climate chamber of 28 one‐year‐old full‐sib families (half diallel with two parents from each population) was also carried out. The results were related to the mortality of the same open pollinated families over the first 18 years in the field. The ranking of the populations was the same in all six freezing experiments as in the field. Significant differences in frost resistance between one‐year‐old open pollinated families were found within all populations except the most northern one. The correlations within populations between frost resistance and field mortality varied considerably between populations and freezing experiments. The results from the two greenhouse experiments showed the best correlations with the cumulative field mortality after 18 years. The freezing test of the 28 full‐sib families resulted in the same mutual ranking, according to the general combining ability of parents within populations, as was obtained from the freezing tests of single tree families.  相似文献   

不同桉树在昆明市海口林场的早期生长研究     

李子光  周庆宏  王有兵  严毅  何银忠  罗建中  陈光云  孔睿余 《林业调查规划》2013,(5):64-66,82

对昆明市海口林场2012年栽植的5种桉树早期生长性状进行了观测研究。结果发现，5种桉树中，造林成活率较高的有本沁桉、邓恩桉及多利桉，树高和地径表现最优的是多利按。不同种桉树中苗圃地生长表现最优的，上山栽植以后生长表现不一定最优，这与不同生长发育阶段、不同环境条件有着密切关系。  相似文献   

兴安落叶松优良家系的早期选择   总被引：2，自引：1，他引：1  

杨丽君  张传静  李长河  姜兴林  潘本立 《防护林科技》2006,(4):35-37

通过对大兴安岭林区落叶松初级种子园中的5年生兴安落叶松幼树高生长资料方差分析,结果表明:兴安落叶松家系间存在显著差异,在低强度选择下可以选出30%左右的优良家系,初步估算了用这些中选无性系组建1.5代种子园可带来的遗传增益,并提出了在大兴安岭地区组建落叶松1.5代种子园的设想。  相似文献   

油橄榄的早实丰产栽培技术   总被引：1，自引：0，他引：1  

韩华柏  王金锡  范成绪  杨佐忠  吴万波 《西部林业科学》2005,34(3):63-66

在调查、总结四川省油橄榄栽培历史、种植技术及其试验研究成果的基础上,从品种选择,种植地选择,整地、造林,栽植后的土、肥、水管理,整形、修剪,病虫害防治等方面系统地介绍了四川省发展油橄榄的早实丰产栽培技术。  相似文献   

早期断奶对母猪繁殖性能影响的研究   总被引：2，自引：0，他引：2  

张建生  李齐贤 《中国畜牧杂志》1993,29(6):6-7

按母猪泌乳期(28天、35天和45天)设3组,选二花脸经产母猪20头,大约克经产母猪35头,断奶至发情、配种和下次繁殖的繁殖周期:二花脸母猪Ⅰ组分别为5.75天、8天和149.25天,Ⅱ组分别为5.1天、7.3天和156.5天,Ⅲ组分别为4.9天,7.0天和166天;大约克母猪Ⅰ组分别为5.2天、7.2天和149.2天,Ⅱ组分别为4.7天、6.7天和156.2天,Ⅲ组分别为4.2天、6.2和165.5天。各品种各组合的情期受胎率均为100％;同品种内各断奶日龄组间的产仔数、产活仔数和初生窝重均无明显差异(P>0.05)。  相似文献   

优质早稻“三高一少”栽培技术研究与应用     

龚述明  戴治平  刘东林 《作物研究》2002,16(1):11-13

1999～ 2 0 0 0年以提高优质早稻成穗率、结实率、整精米率、减少农药污染为研究内容 ,选用中优早 81、香两优 6 8为材料 ,运用小区对比试验方法 ,开展了育秧方式、基本苗、施氮量、收割时期、农药防治方法等栽培试验。结合近几年优质早稻开发种植实践经验 ,对优质早稻高产栽培的主要技术指标进行了系统分析 ,形成了优质早稻“三高一少”调优保优高产栽培技术体系 ,即优质早稻每公顷产量 6 0 0 0～ 75 0 0 kg的关键技术指标。在双峰县普遍推广应用 ,效果十分显著。  相似文献   

Development of a New Foxtail Millet Germplasm with Super Early Maturity and High Iron Content     

LIU Zheng-li  SUN Shi-xian  CHENG Ru-hong  HUANG Wen-sheng  LIU Jun-xin  QU Zhu-feng  XIA Xue-yan  SHI Zhi-gang 《中国农业科学(英文版)》2006,5(7):558-562

Super Early Maturation No.2 is a new foxtail millet germplasm developed by using the targeted-character-gene-bank-breeding method. It has several outstanding characteristics. (1) Super early maturity. It can normally mature in Bashang, Hebei Province, China, where the altitude is around 1 400 meters, and it needs 1650°C of effective accumulated temperature in the growing period. (2) Millet is rich in iron. The iron content of the millet of Super Early Maturation No.2 is 54.10 mg kg⁻¹, which is 62.0% higher than the average iron content of the foxtail millet varieties in China. (3) High crude fat content. Its crude fat content is 6.24%, which is 54.1% higher than the average content of foxtail millet varieties in China. (4) High crude protein content. The average of the crude protein content of all the foxtail millet varieties in China is 12.71%, only 5% varieties surpass 14%, however, the crude protein content of Super Early Maturation No.2 is 14.36%, which is rare in improved varieties of foxtail millet in China. (5) Overall characteristics are good.  相似文献   

华南早晚造籼稻品质变化规律与定级探讨   总被引：2，自引：0，他引：2  

陈嘉东  刘光亚  钟国才  冯朝晖  周少川  李宏  王家生  黄道强  卢德城 《粮食储藏》2003,32(4):37-40

应用国家优质稻谷标准GB／T17891-1999对华南籼稻早晚两造种植的稻谷样品进行了品质指标系统测定，结果表明：不同品种(组合)早晚造品质变化具有特异性。  相似文献