不同厚度PE膜包装对青皮核桃果实采后鲜贮效果的影响

通过研究不同厚度PE膜包装对青皮核桃果实采后鲜贮效果的影响,为生产上探寻简易、高效的青皮核桃保鲜技术提供依据。以“温185”青皮核桃为试材,以普通地膜包装为对照,采用PE30(30μm)、PE40(40μm)及PE50(50μm)3种不同厚度薄膜包装处理,于(-1±1)℃条件下贮藏,定期测定青皮核桃贮藏过程中营养和品质指标。结果表明:PE40包装自发气调能力最强,贮藏14 d后,袋内气体达到平衡,O2体积分数为5.5%~6.5%,CO2体积分数为4.5%~5.5%。与对照相比,不同厚度PE膜包装可较好地维持青皮核桃含水量、色泽及硬度,抑制核仁含水量及酸价的下降。PE40包装对青皮核桃果实采后鲜贮效果显著,可使其贮至70 d时,腐烂指数为12.17%,裂果率为16.67%,核仁保鲜率达到100%,生产上推荐使用PE40包装对青皮核桃进行贮藏保鲜。     

阿巴嘎绒山羊的研究和分析

本文系统地阐述了阿巴嘎绒山羊的形成、外形、体尺、体重、绒量、绒质、繁殖以及适应性等、并在一些重要指标上与二郎山绒山羊作了对比,最后还提出了一些建议。     

克迪球预防人工感染鸡球虫病效果的观察

采用接种孢子化球虫卵囊的方法,复制鸡球虫病,观察在饲料中添加克迪球预防鸡球虫病的效果,计算各实验组人工感染柔嫩艾美耳球虫鸡的存活率、相对增重率、血便记分、盲肠病变记分和卵囊值,并求出克迪球的抗球虫指数。结果发现克迪球能完全预防鸡在人工感染球虫卵囊后发生球虫病,用药组未出现盲肠病变和血便,盲肠内容物内检不出卵囊,并能显著提高鸡的相对增重率。表明克迪球对鸡柔嫩艾美耳球虫病有良好的预防作用。     

Branch development responses to planting density and yield stability in soybean cultivars

The objective of this study was to elucidate variability among soybean cultivars in yield response at different planting densities in reference to branch development. We investigated the main stem and branch seed yield and the branching characteristics of determinate Hokkaido and indeterminate US cultivars at the Rakuno Gakuen University in Ebetsu. In 2009 and 2010, two Japanese and two US cultivars were grown at three densities from 9.5 to 20 plants m^?2. In 2011 and 2012, three cultivars from each region were cultivated at three densities from 8.3 to 22.2 plants m^?2. The seed yields of the US cultivars at densities of 16.7 plants m^?2 or less were markedly higher than those of the Hokkaido cultivars, showing that their yield is less sensitive to lower planting density than Hokkaido cultivars. The difference in yield in response to planting density among cultivars was closely associated with a larger increase in branch seed yield with lower planting density, which effectively compensated for the decrease in main stem number per unit land area. The variability of branch development in response to planting density (branching plasticity) was quantified by correlating branch performance with plant spacing (land area per plant). Some US cultivars exhibited greater branching plasticity than Japanese cultivars with similar growth duration. Results of this study suggest soybean cultivar differs in responsiveness to varied planting density through different branching plasticity.