共查询到20条相似文献,搜索用时 62 毫秒
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为明确陕西关中平原地区地区适栽羊肚菌菌株,本试验收集了10株羊肚菌菌株,从羊肚菌子实体农艺性状、产量及主要营养成分三个方面进行分析,以期筛选出适于本地区栽培优良菌株。结果表明:(1)10个不同菌株栽培后所得的羊肚菌子实体产量差异性显著,菌株 401和菌株 8号的鲜重和干重较其他品种具有明显优势;(2)子实体农艺性状方面有差异,从个头、重量和商品性三个方面分析,菌株8号、菌株 401 较其它菌株有显著优势;(3)羊肚菌子实体主要营养成分含量有差别,10个羊肚菌品种的粗纤维、多糖含量和总氨基酸较高,而脂肪含量较低。综上所述,菌株401和8号两个品种相对适宜在陕西关中平原地区进行栽培。 相似文献
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以湖南农业大学芒属能源植物资源圃8份种质资源材料的种子为研究对象,对种子长、宽、厚、长宽比和千粒质量5个种子表型性状进行了系统比较分析。采用方差分析、多重比较、相关分析和聚类分析等方法对这8份材料种子表型性状差异进行了探讨。结果表明:8份种质资源材料的种子在5个性状上都达到极显著水平差异,不同材料种子之间表型性状变异系数均值的大小顺序是种子厚>长宽比>宽>长>千粒质量;相关性分析表明种子长与种子宽、种子千粒质量有显著关系,种子宽与种子厚、千粒质量有极显著相关性,种子厚与千粒质量有极显著相关性,长宽比与种子宽、种子厚、千粒质量呈现负相关;系统聚类可以将这8个材料分为3类。 相似文献
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为探明毕纳1号烟草最适移栽期,研究移栽期对烟草气候斑病的发生和生长的影响。结果表明:适宜的移栽期有利于减轻毕纳1号烟草气候斑病的发生,可改善毕纳1号烟草农艺性状、提高烟叶叶绿素含量,并在一定程度上间接提高烟株抗病性;其中4月27日移栽综合表现最佳,移栽后60 d发病率和病情指数分别为20.10%和2.67,较其他2个移栽期分别显著(P<0.05)降低9.66%~12.12%和1.30~1.61。该结果为毕纳1号烟草适时移栽和气候斑病综合防控提供了技术参考。 相似文献
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胡继鑫 《农业机械化与电气化》2012,(9):1-4
以特优质早熟杂交粳稻——辽优0201的衍生系为试材,设计田间试验,考察水稻穗部性状与水稻产量及品质之间的相关性。研究结果表明:穗部性状对产量的影响明显大于其对品质性状的作用;穗部性状主要是通过对粒型的作用来影响稻米品质的。 相似文献
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为确定辽单565在辽宁地区制种的最佳种植密度,采用对比试验的方法,研究不同密度对种子农艺性状及种子活力的影响。试验结果表明:不同制种密度对农艺性状及种子活力影响不显著;4500株/667m^2密度下的发芽率最高,种子活力水平和冷发芽结果也较高。为辽单565制种的最佳密度。 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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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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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