共查询到20条相似文献,搜索用时 78 毫秒
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玉米的深松免耕技术是在可持续发展战略下,在玉米培育过程中提高单产的种植方式,这种方式在我国大部分种植玉米的地区都比较适用。本文通过从采用深松免耕技术后的土壤物理性质和玉米产量的研究,意在寻求玉米培育中深松免耕技术的发展之路。 相似文献
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王福义 《农业机械化与电气化》2013,(10):74-75
分析深松在玉米保护性耕作中的作用,从深松铲类型、施肥装置、护苗装置3方面,探讨玉米中耕深松机具的选择原则,论述玉米机械中耕深松的作业要求和规程.为推广应用玉米中耕深松机械化技术提供理论参考。 相似文献
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秸秆残茬覆盖对土壤贮水量、地温及大豆产量的影响研究 总被引:1,自引:0,他引:1
试验通过深松覆盖、浅松覆盖、玉米原垄留茬覆盖、玉米原垄留茬条带覆盖、玉米原垄留茬全覆盖与传统耕作对比,旨在得出各种耕作措施对土壤贮水量、地温的影响,并通过对大豆产量的对比分析,得出能够提高大豆产量的最佳秸秆残茬覆盖方式。试验结果表明,不同耕作处理模式对土壤贮水量影响不同,其中玉米原垄留茬全覆盖影响最大,浅松覆盖影响最小;5种秸秆残茬处理的地温均低于传统耕作,深松覆盖和浅松覆盖更接近于传统耕作。浅松覆盖和深松覆盖是有利于提高产量的耕作方式。 相似文献
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通过玉米机械化保护性耕作的介绍,阐述了玉米机械化保护性耕作中机械深松的技术要求和深松方法,指出了玉米机械化保护性耕作中机械深松的重要意义。 相似文献
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研究不同水氮配施对轮作冬小麦-夏玉米灌浆期叶面积指数、光合速率、蒸腾速率及叶片水分利用效率的影响。结果表明,冬小麦旗叶光合速率和蒸腾速率均以处理W1500N210最高,叶面积指数和叶片水分利用率均以处理W1500N270最高,夏玉米叶片光合速率在处理W1500N270达到最高,蒸腾速率则以处理W1500N210最高;灌水和施氮及其交互效应对冬小麦、夏玉米叶面积指数、叶片光合速率、蒸腾速率和叶片水分利用率均有显著影响;冬小麦、夏玉米灌浆期叶面积指数、叶片光合速率、蒸腾速率和叶片水分利用率均随施氮量和灌水量的增加而增加;但施氮量超过210kg/hm2时不再显著增加。 相似文献
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耕作方式对豫东夏玉米产量和水分利用效率的影响 总被引:5,自引:2,他引:3
豫东地区夏玉米生长季恰逢雨季,季节性强降水经常导致农田积水,使玉米生长受到涝渍灾害威胁,为探索当地夏玉米的适宜栽培管理模式,试验设置播前翻耕、深松和旋耕3种耕作处理,并以当地种植习惯的免耕贴茬播种为对照,通过田间小区试验重点研究了不同耕作方式对农田土壤水分、夏玉米农艺性状、籽粒产量及水分利用效率的影响。结果表明,与免耕贴茬播种处理相比,翻耕和深松处理均能在强降雨后有效降低表层土壤含水率,增加夏玉米生长中后期的株高和叶面积;翻耕和深松处理籽粒产量分别提高了26.55%和19.67%;翻耕和深松处理水分利用效率分别提高了15.37%和9.69%,旋耕处理降低了3.45%。综合考虑夏玉米籽粒产量、水分利用效率等因素,翻耕和深松措施是适宜于豫东地区夏玉米高产的栽培模式。 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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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
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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