水果商品化处理技术发展趋势与对策     

邓良平 《农产品加工．学刊》2008,(12)

综述了国内外水果商品化处理技术的研究进展与存在问题,同时提出了进一步发展水果商品化处理技术的措施。  相似文献   

Optimizing yield,water requirements,and water productivity of aerobic rice for the North China Plain   总被引：1，自引：0，他引：1  

Changying Xue  Xiaoguang Yang  Bas A. M. Bouman  Wei Deng  Qiuping Zhang  Weixiong Yan  Tianyi Zhang  Aji Rouzi  Huaqi Wang 《Irrigation Science》2008,26(6):459-474

Water resources for agriculture are rapidly declining in the North China Plain because of increasing industrial and domestic use and because of decreasing rainfall resulting from climate change. Water-efficient agricultural technologies need to be developed. Aerobic rice is a new crop production system in which rice is grown in nonflooded and nonsaturated aerobic soil, just like wheat and maize. Although an estimated 80,000 ha are cultivated with aerobic rice in the plain, there is little knowledge on obtainable yields and water requirements to assist farmers in improving their management. We present results from field experiments with aerobic rice variety HD297 near Beijing, from 2002 to 2004. The crop growth simulation model ORYZA2000 was used to extrapolate the experimental results to different weather conditions, irrigation management, and soil types. We quantified yields, water inputs, water use, and water productivities. On typical freely draining soils of the North China Plain, aerobic rice yields can reach 6–6.8 t ha⁻¹, with a total water input ranging between 589 and 797 (rainfall = 477 m and water application = 112–320 mm). For efficient water use, the irrigation water can be supplied in 2–4 applications and should aim at keeping the soil water tension in the rootzone below 100–200 kPa. Under those conditions, the amount of water use by evapotranspiration was 458–483 mm. The water productivity with respect to total water input (irrigation plus rainfall) was 0.89–1.05 g grain kg⁻¹ water, and with respect to evapotranspiration, 1.28–1.42 g grain kg⁻¹ water. Drought around flowering should be avoided to minimize the risk of spikelet sterility and low grain yields. The simulations suggest that, theoretically, yields can go up to 7.5 t ha⁻¹ and beyond. Further research is needed to determine whether the panicle (sink) size is large enough to support such yields and/or whether improved management is needed.  相似文献   

水稻种子包衣剂在陕南应用效果初探   总被引：1，自引：0，他引：1  

王海潮  董学雁  王雅婧  邓根生  何交道  王地  张建平 《陕西农业科学》2008,54(6):3-5

应用种衣剂处理水稻种子在我省尚处起步阶段。试验用4种种衣剂处理水稻种子,通过测定其对水稻种子安全性、对秧苗生理指标的影响、对秧苗期病虫害的控制效应及小区试验产量分析,表明该4种种衣剂处理对水稻种子安全;提高秧苗苗高、叶龄、根长,显著提高分蘖数、根条数、白根数和干重,促进多蘖化秧形成,明显提高成苗率;并对秧苗期恶苗病及稻蓟马有明显控制作用,利于提高水稻产量。  相似文献   

Phylogenetic analysis of the citrus Huanglongbing (HLB) bacterium based on the sequences of 16S rDNA and 16S/23S rDNA intergenic regions among isolates in China     

Fang Ding  Xiuxin Deng  Ni Hong  Yun Zhong  Guoping Wang  Ganjun Yi 《European journal of plant pathology / European Foundation for Plant Pathology》2009,124(3):495-503

Phylogenetic analysis of Chinese isolates of the citrus Huanglongbing (HLB) bacterium based on the 16S rDNA and 16S/23S rDNA intergenic regions sequences was carried out. Nine HLB samples collected from different hosts with different symptoms in seven Chinese provinces, were subjected to PCR for amplifying and sequencing the 16S rDNA. The identity level among Chinese isolates was 98.5% to 100% and was the same with the Indian HLB isolate ‘Poona’ (GenBank accession number: L22532). By contrast, identity values were 97.5% to 97.8% with Candidatus Liberibacter africanus strain ‘Nelspruit’ (L22533), 96.3% to 97.3% with Ca. L. africanus subsp. ‘Capensis’ (AF137368), 95.3% to 96.5% with the Ca. Liberibacter sp. ‘LSg2’ (AY919312), and 94.9% to 96.0% with a strain of Ca. L. americanus from Brazil (São Paulo State; AY742824). A phylogenetic tree constructed with 16S rDNA sequences showed that all Chinese isolates belong to Ca. L. asiaticum. Analysis of the 16S/23S rDNA intergenic region was conducted on 18 HLB-diseased citrus samples with different symptoms, collected in seven provinces. These isolates showed no obvious variation and had an identity level >99.0% with one another. Sequence analysis of 16S/23S rDNA intergenic region and the relative phylogenetic tree showed that the Chinese isolates are very close to Ca. L. asiaticus, and distinct from Ca. L. africanus and Ca. L. americanus. These results suggest that the Chinese HLB isolates belong to the species Candidatus Liberibacter asiaticus. This is the first report on the classification of HLB isolates from China based on molecular investigations.  相似文献   

关于通州新城建设的思考——落实"人文北京、科技北京、绿色北京"的要求     

邓乃平 《北京农业职业学院学报》2009,23(6):49-53

奥运会后,北京市提出了建设"人文北京、科技北京、绿色北京"的目标.作为北京重点发展的新城之一,通州在新城建设中认真落实"三大北京"理念,全力推动新城建设上水平.落实"人文北京"要求,大力弘扬运河文化,将文化资源优势转变为产业优势.落实"科技北京"要求,大力调整产业结构,使经济发展更多依靠科技进步和管理创新.落实"绿色北京"要求,大力建设生态文明,构建滨水宜居新城.  相似文献   

学习借鉴日本经验 促进林业又好又快发展     

陈登  苏文辉  胡根全  权德胜 《国家林业局管理干部学院学报》2009,8(4):52-58

日本规范化和制度化的林业职员研修、健全的与可实施的森林计划制度体系、强化保护和促进合理利用的自然公园制度、完备的和保障机制健全的森林组合体系、科学合理的森林植被恢复措施等方面的先进经验,对于促进我国林业又好又快发展、充分发挥林业综合效益等方面可提供有益参考和借鉴。  相似文献   

不同绵羊品种脂肪组织中挥发性脂肪酸的组成分析     

韩卫杰  杨惠玲  陈玉林 《西北农林科技大学学报(自然科学版)》2009,37(12):39-44

【目的】研究绵羊品种对其脂肪组织中挥发性脂肪酸(C4~C10)组成的影响,为深入研究羊肉膻味的形成机理奠定基础。【方法】采用同时蒸馏萃取和气相色谱技术,对小尾寒羊、滩羊和同羊皮下脂肪组织中的挥发性脂肪酸进行了定量分析。【结果】采用同时蒸馏萃取和气相色谱技术可在绵羊脂肪组织中检测到对羊肉膻味贡献较大的4-甲基辛酸和4-甲基壬酸。小尾寒羊、滩羊和同羊的总挥发性脂肪酸含量分别为261.109,169.124和271.898mg/kg;其中直链脂肪酸含量分别为217.792,143.036和229.059 mg/kg,支链脂肪酸含量分别为43.317,26.088和42.839 mg/kg。4-甲基辛酸和4-甲基壬酸是对羊肉膻味贡献较大的挥发性脂肪酸,其在小尾寒羊、滩羊、同羊脂肪组织中的含量分别为20.317和9.772,14.150和5.597,12.835和6.403 mg/kg。【结论】应用此方法可以检测到对羊肉膻味有主要作用的挥发性脂肪酸,且不同绵羊品种对其脂肪组织中挥发性脂肪酸的组成有一定影响,小尾寒羊脂肪组织中4-甲基辛酸和4-甲基壬酸含量有大于滩羊和同羊的趋势。  相似文献   

土壤改良剂的研究与应用现状   总被引：17，自引：0，他引：17  

张黎明  邓万刚 《华南热带农业大学学报》2005,11(2):32-34

综述国内外土壤改良剂的研发情况,以及土壤改良剂在干旱土壤改良与防止水土流失、盐碱地改良、土壤酸化治理上的应用。  相似文献   

提高冷浸田再生稻产量的途径   总被引：2，自引：0，他引：2  

陈冬林  邓小华 《中国稻米》2005,11(2):24-25

中稻收获后蓄留再生稻这种种植方式近年来有呈持续发展势头,特别是在冷浸田这类低产田中采用,有广阔的发展前景。本文阐述了提高冷浸田再生稻产量的有效途径。  相似文献   

梅雨季节应防犬皮肤病     

贺星亮  郭浩  邓春梅 《中国工作犬业》2005,(6):25-25

每年的5月底至7月初,我国南方大部分地区进入梅雨季节,多雨、闷热的气候使得犬舍、犬体潮湿。犬长期处于应激状态,抗病能力下降,然而各种皮肤病病原微生物却处于繁殖旺季,这就导致了各类皮肤病发病率显著上升。为了减少犬皮肤病的发生,本文就皮肤病的预防提出几点方法,以供参考。  相似文献