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玉米大垄双行播种机械化栽培技术能使玉米在生长发育中,合理利用光、热、气等自然条件,实现玉米清种,具有明显的抗旱增产的效果。其技术内容如下: 一、玉米大垄双行播种免中耕机械化栽培技术内容和工艺流程玉米大垄双行播种免中耕机械化栽培技术是多个单项技术综合的综合技术,它可分为覆膜与不覆膜两种。通过机械整地 相似文献
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从地块选择、耕整地、品种选择、种子处理、机械深施肥、化学除草、机械覆膜、科学间苗、化控促熟等方面,介绍玉米大垄双行覆膜机械化栽培技术的要点和需要注意的事项,用以指导农业生产。 相似文献
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采用花生覆膜大垄双行机械化栽培技术可以有效利用土地,提高种植密度,增强抗旱能力,促进花生生长。介绍花生机械化发展现状及花生覆膜大垄双行机械化栽培技术的操作要点,通过经济效益分析,表明该技术具有提高产量、节本增效等优点。 相似文献
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玉米大垄双行覆膜机械化栽培技术要点 总被引:4,自引:0,他引:4
玉米大垄双行覆膜机械化栽培技术(简称玉米“大双覆”)是指将传统的两条65cm或60cm宽的小垄合并成一条130cm或120cm宽的大垄,在大垄上适当加密种植两行玉米,小行距40cm,大行距80cm或90cm的一种新型先进玉米种植栽培技术,能够充分发挥农作物边际效应,提高光能及水肥利用率,增加积 相似文献
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通过对辽南海城耿庄地区玉米大垄双行双株疏密种植机械化栽培技术进行研究,总结玉米大垄双行双株疏密种植机械化栽培技术流程及应用效果,为该玉米种植模式在辽宁省大面积推广应用提供科学依据。 相似文献
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玉米大垄双行高产栽培技术研究 总被引:1,自引:0,他引:1
《农业科技与装备》2015,(6)
玉米大垄双行栽培方式是获得玉米增产的重要技术措施之一。阐述玉米大垄双行栽培技术的增产效果,分析增产的原因,提出有效实施玉米大垄双行高产栽培技术的建议,以期为玉米大垄双行高产栽培技术的发展提供参考。 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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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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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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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