共查询到20条相似文献,搜索用时 62 毫秒
1.
<正>2016年3月,根据自治州农机推广站的安排,博湖县农机局在博湖县塔温觉肯乡塔温觉肯村实施了春小麦窄行匀播模式与常规播种模式对比试验。本次试验采用7.5 cm等行距条播(窄行匀播)和15 cm行距常规播种两种播种模式播种春小麦,播量保持不变,土壤类型、施肥水平、灌溉条件等情况一致,从而对不同播种模式下小麦的增产情况进行分析,总结试验经验与体会。一、试验目的为进一步挖掘小麦增产潜力,探索滴灌条件下 相似文献
2.
3.
<正>西安市灞桥区从2014年5月开始实施万亩秸秆综合示范田建设项目,新合农业技术综合服务站根据所承担项目的任务,对玉米的精量播种和普通机播进行了产量对比试验,现将试验情况介绍如下。1试验目的试验玉米在秸秆还田的条件下精量机播与普通机播的产量对比。精量机播就是用精量播种机按行距64cm、株距30cm穴播;普通机播就是用按行距64cm进行条播(播种量依据种子袋说明 相似文献
4.
发展精确的农业耕作设备,提高土地单位产出率,已成为农业机械化发展的必然趋势。中耕作物的精密播种技术已经日趋成熟,人们已开始把精播技术应用到其他传统条播作物,特别是小麦精密播种。小麦精播高产栽培技术的一个基本原则要求播种机能够完成播种均匀,播深一致,等行距播种等农艺要求。小麦精播技术的关键在于先进、高质量、高效率的小麦精密播种机的应用。 相似文献
5.
6.
本规范适宜易门县一年两作地区大春玉米种植,与大中型拖拉机配套进行免耕(或已耕地)播种。以下列两个示范机型为例制定本规范。1)河北农哈哈集团生产的2BYFSF—4型玉米免耕施肥精播机,播幅230cm,播行4行,行距67cm,株距可调(130mm~310mm),配套动力25马力~40马力;2)山东大华农业机械有限公司生产的2BMYF—4型小麦/玉米旋耕施肥播种机,播幅230cm,播行4行,行距63cm,株距可调(130mm~310mm),配套动力90马力以上,两机型均采用等行条播,其它播种机型可参照实施。 相似文献
7.
8.
1.机械化节水精播技术 机械化节水精播技术是指待播地不需要人工洇地造墒,直接利用节水精播机具,一次完成开沟、集中深施化肥、条灌或穴灌浇水、条播或穴播种、覆土镇压、喷洒除草剂(可选功能)、铺膜(可选功能)等作业的农机农艺综合技术体系.适用于干旱、半干旱地区抗旱播种作业,可播种棉花、花生、春玉米和大豆等多种作物.机械化节水精播技术有以下优点: 相似文献
9.
2BJ-2型小麦疏株密植播种机(以下简称人力播种机),具有适应性强、操作调整方便、一次完成开沟、播种、覆土三道工序、行距、播深可调、播后苗齐苗壮,作物不易倒伏等特点。比人工条播每公顷省种22.5千克. 相似文献
10.
2BQM-2铺膜播种机配套动力18k W,能够一次性完成开沟、播种、施肥、覆土及铺膜等功能,适合中小规模种植农户使用。参照《JB/T7732—2006铺膜播种机》行业标准,对该机在内蒙古自治区鄂尔多斯市准格尔旗进行了玉米精密播种田间试验。结果表明:该机作业株距与理论株距偏差为(-2,2)cm;作业播深与理论播深偏差为(-1,1)cm,作业行距与理论行距偏差为(-2,1)cm,播种重播率为1.5%,空穴率为0.4%,种子破碎率为0,穴粒数合格率为96.2%,膜边覆土合格率为98%。试验数据表明:该机型适合大面积推广使用,可为实现精密机械化种植提供保障。 相似文献
11.
12.
13.
14.
15.
《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
16.
17.
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
18.
19.
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
20.
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