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<正>温室栽培果桑,开花坐果时期采用蜜蜂授粉技术措施能实现在最佳时间授粉,且授粉充分、受精完全,对提高坐果率和坐果质量有明显的作用,进而提高果桑的产量和品质。因为温室内根本没有或很少有其它昆虫,人为地引入蜜蜂是解决授粉问题理想的办法。1适用范围本文阐释了有关蜜蜂授粉蜂群的准备、温室果桑授粉技术的操作程序和管理要求等内容。本文技术措施适用于黑龙江省的温室果桑生产,是其生产的重要配套措施之一。2授粉蜂群的准备黑龙江地区温室果桑蜜蜂授粉主要选择东北黑蜂和意大利 相似文献
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近年来,由于土地过度开发利用,单一作物大面积连片种植,杀虫剂的广泛使用,导致包括蜜蜂在内的传粉昆虫大量减少,致使许多需要传粉的农作物授粉严重不足,作物坐果率和产量急剧下降,迫使人们对大田作物采用人工授粉、设旌作物采用涂抹生长激素等技术。人工授粉虽然对提高农作物坐果率有一定效果,但带来了生产成本的大幅度提高,设施水果和蔬菜采用化学生长调节剂后,不仅影响果实品质,而且食品安全问题让人堪忧。蜜蜂作为理想的农作物授粉者,已为越来越多的人们所认识。 相似文献
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一、小绿豆的市场前景
黑龙江省五常市作为中国绿色优质水稻之乡,已不再局限于外销优质大米的市场经营模式,早已开始挖掘大米深加工的市场潜力,作为黏大米的食品配料,优质小绿豆具有很大的市场需求.更重要的是,五常一些制药企业也大量需要小绿豆,由于小绿豆种植具有不稳定性,造成制药配料小绿豆供应不稳定.原因是以往小绿豆都是田间地头小批量生产,机械化程度低,产量不足,成本高价格贵,满足不了食品及制药企业的需求.同时,五常市作为国家优质水稻生产基地,旱作耕地面积非常有限,再加上其他作物的种植面积,使小绿豆可耕种面积非常有限.小绿豆的市场需求是刚性的,而可利用耕地资源是有限的,如何解决这一矛盾,原则就是确定一种优质高效的小绿豆机械化生产技术. 相似文献
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本溪地区具有发展优质水稻的优势。介绍水稻品种稻花香2号的独特品性,对其在本溪地区种植发展存在的优势及自身缺点进行剖析,探讨其高产栽培技术措施,以期为稻花香2号水稻在本溪地区的种植推广提供技术支持。 相似文献
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黑龙江省五常市是我国优质水稻主产区,但其北部旱作区玉米种植面积也很大。2010年,五常市政府及农机主管部门做了大量工作,在资金和技术上对玉米机械化收获工作给予大力扶持, 相似文献
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黑龙江省是我国粳稻主产区之一,年种植面积在5000万亩以上,目前我省水稻种植主要采用的毯式育苗,机械高速插秧,这样的插秧方式虽然提高了水稻栽植的生产效率,但水稻插秧后第一个分蘖无法成活,有7~10天缓苗期.为此,2020年黑龙江省农机推广总站联合中联重科农业机械有限公司在牡丹江市、呼兰区、方正县、五常市、通河县、尚志市... 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献