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水稻机插秧和机直播的群体质量比较 总被引：1，自引：0，他引：1
为了更好地促进水稻种植机械化的发展，不断推进水稻种植机械化的进程，本文根据试验示范两种机械化种植方式下秧苗群体有关参数比较、确定出水稻高产栽培的机插秧种植模式。 相似文献
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水稻精确定量的栽培主要是在水稻群体栽培技术、水稻叶龄模式等理论和技术基础上,使用最好的种植方式,达到"高效、安全、优质"的种植目的。本文利用水稻机对精确定量栽培的发展做出了较为详细的叙述。 相似文献
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对机插水稻生育特点及管理对策的初步探讨 总被引：7，自引：0，他引：7
“九五”以来，江苏省在解决了水稻收获机械化技术问题后，便着力于水稻种植机械化技术的探讨与实践。通过多年的试验完善，已基本形成了适于长江中下游水稻种植机械化栽插的技术体系，并在大面积试验示范中取得成功突破。长期以来，江苏省基于常规栽培方式，逐步形成并大面积推广了水稻高产群体质量栽培技术，然而由于机插水稻育秧、栽植等方面的技术特点和机插水稻自身的生长发育规律，这就要求在正确认识机插水稻生育特点的前提下，采取相应的田间管理措施，以实现机插水稻的高产稳产。一、机插秧试验示范概况按照引进“装备技术、创新育… 相似文献
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一、精少量播种机械化技术是提高三麦单产、实现节本增效的重要措施近年来，盐城市三麦单产水平已从全省的第一位退到第三位，列徐州、连云港两市之后。为什么会由领先变落后，主要是三麦播种量偏大，群体栽培质量不高。目前，全市三麦播种方式仍以少（免）耕机条播为主，... 相似文献
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扬中市稻茬机条播小麦综合高产配套技术扬中市农业局瞿廷广一、栽培策略走“适群体，壮个体，高积累”的群体质量栽培路子，稳定穗数，主攻大穗，提高粒重。穗粒组合为：每公顷有效穗４００～４２０万，每穗实粒数３６～３８粒，千粒重３８～４０克。二、阶段指标播种阶段... 相似文献
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乌盟农机所科技人员根据北方马铃薯种植区的土壤特点，对小型马铃薯栽培系列机械进行了研制。系列机械由种植机、中耕机和挖掘机组成，它具有结构简单、效率高、操作容易、适应性强的特点。1种植机近几年，马铃薯种植方式也随着科学种田的发展实行了多样化。如马铃薯覆膜种植、宽垄种植等。本机具适应平作或垄作两种形式，行距可随当地的种植习惯调整。1．1设计参数的确定根据农艺要求，设计参数如下：配套动力：11kw小四轮拖拉机生产率：0．27ha／h作业行数：2行播深：8～10cm株距：25～35cm行距：85、75、65、55cm四档可调。漏播率：≤5％… 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