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以＂沈农燕麦一号＂为试材,采用二次四因子二次通用旋转组合设计,研究辽宁省适宜燕麦生长的播种密度和肥料施用量。结果表明：在产量≥3000kg/hm2的147个方案中,播种量在174.00～185.25kg/hm2,N、P2O5、K2O施用量分别为135.75～152.25kg/hm2、37.35～41.10kg/hm2、110.40～121.05kg/hm2,可获得3581.25kg/hm2以上的产量,N∶P2O5∶K2O最适比例为3.67∶1.00∶2.95。 相似文献
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冷棚马铃薯“3414”试验结果初报 总被引：1，自引：0，他引：1
通过"3414"田间试验.研究不同氮磷钾水平对马铃薯产量的影响.经统计分析获得冷棚马铃薯三元二次肥料效应甬数为Y=1563.74+56.93N+1 16.45P+4.84NP+7.37NK-9.42PK-6.31N2-5.92P2,求得马铃薯最高产量施肥量为:N=12.05 kg/667 m2,P2O5=9.42 kg/667m2,K2O=6.72 kg/667m2;最佳产量施肥量为:N=11.58 kg/667m2,P2O5=8.39 kg/667m2,K2O=7.19 kg/667m2. 相似文献
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赵淑杰 《农业机械化与电气化》2008,(6)
以大豆为供试作物,采用二次回归3414设计,分析氮磷钾肥对大豆生长发育的影响。试验结果表明:氮磷钾肥对大豆有明显的增产效果。采用回归分析方法,探讨氮磷钾肥的合理施用量,章党镇的最佳施肥量为:N3～3.5kg/667m2、P2O52.7～2.8kg/667m2、K2O4～4.2kg/667m2;兰山乡的最佳施肥量为:N3kg/667m2、P2O54.5kg/667m2、K2O4.5kg/667m2。 相似文献
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通过"3414"田间试验,研究不同氮磷钾水平对马铃薯产量的影响。经统计分析获得冷棚马铃薯三元二次肥料效应函数为Y=1563.74+56.93N+116.45P+4.84NP+7.37NK-9.42PK-6.31N2-5.92P2,求得马铃薯最高产量施肥量为:N=12.05kg/667m2,P2O5=9.42kg/667m2,K2O=6.72kg/667m2;最佳产量施肥量为:N=11.58kg/667m2,P2O5=8.39kg/667m2,K2O=7.19kg/667m2。 相似文献
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抚顺县大豆"3414"田间试验结果初报 总被引：2，自引：0，他引：2
以大豆为供试作物，采用二次回归“3414”设计，分析氮磷钾肥对大豆生长发育的影响。试验结果表明：氮磷钾肥对大豆有明显的增产效果。采用回归分析方法，探讨氮磷钾肥的合理施用量，章党镇的最佳施肥量为：N3-3．5kg/667m^2、P2O5 2．7-2．8kg/667m^2、K2O 4-4．2kg／667m^2；兰山乡的最佳施肥量为：N3kg／667m^2、P2O5 4．5kg／667m^2、K2O 4．5kg／667m^2。 相似文献
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东北黑土区是我国玉米的主产区,但该地区"十年九春旱",春季干旱已成为限制该地区农业发展的主要因素.在坐水施肥条件下,采用"311-B"D饱和最优设计,通过对玉米产量结果进行二次回归拟合,建立水肥回归数学模型,因素效应分析结果表明,影响玉米产量的因素为坐水效应>施氮效应>施磷效应;在玉米覆膜及基施肥硫酸钾150 kg/hm2时,N(追肥)用量为80.0～103.9 kg/hm2,P2O5(底肥)用量为66.1～90.8 kg/hm2,坐水量为63.4～76.5kg/hm2时,黑土区玉米可获得13 500 kg/hm2以上的产量. 相似文献
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张立明;潘玉荣;包桂霞;张翠萍;顾景辉;史俊玲;刘春阳;王晓丽;刘艳英;王晶 《农机具之友》2013,(6):53-54
通过"3414"田间试验研究,获得在前郭砂壤土耕地土壤花生最佳施肥量施肥模型;最佳施肥量:N肥=75kg/hm2,P肥=135kg/hm2,K肥=120kg/hm2。花生产量为:y=3573kg/hm2,施肥比例N:P:K=1:1.8:1.6;结果表明,氮、磷、钾在一定施肥水平下对花生具有不同增产作用,氮肥对花生产量起决定性作用,钾肥仅次于氮肥、磷肥最小,对花生产量影响不大,施磷对花生增产不明显。 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