不同季节旱冬瓜扦插试验     

袁莲珍  史富强  杨斌  陈伟  刘际梅  李玉华  张树红 《林业调查规划》2013,(6):121-123

在云南普洱市思茅区和景洪市普文两地开展不同季节的旱冬瓜扦插试验。结果表明：旱冬瓜不同季节扦插,夏季愈伤组织和不定根出现时间早一些,冬季最迟,春季和秋季居中;旱冬瓜的扦插受季节的影响明显;在普洱市思茅区最适旱冬瓜扦插季节为秋季（9月份）;在景洪普文最适旱冬瓜扦插季节为春季（3月份）。  相似文献   

江苏里下河地区“一稻三虾”生态种养模式绿色生产关键技术(英文)     

张家宏  毕建花  朱凌宇  王守红  寇祥明  韩光明  王桂良  徐荣  吴雷鸣  唐鹤军 《农业科学与技术》2017,18(8)

阐述了江苏里下河地区水稻+克氏原螯虾共(连)作绿色种养模式中"三大、二水、一网"的配套工程建设,稻前虾、稻中虾和稻后虾"一稻三虾"种养时空耦合技术,以及绿色施肥、绿色防控以及水位调控和投饵技术,为发展稻田综合种养,实现一水两用、一田四收绿色生产提供技术支撑。  相似文献   

乌龙茶饮料的反渗透浓缩试验   总被引：1，自引：0，他引：1  

胡建农  金心怡  林顺权 《福建农业学报》2000,15(4):57-61

研究茶饮料的温度、浓度和压力对反渗透浓缩速度的影响,检验反渗透膜的再生性能,测量浓缩过程的能耗,鉴定浓缩茶饮料的品质、结果表明,该工艺与传统工艺相比,具有高品质、低成本、易操作的特点,有推广潜力。  相似文献   

Seasonal Changes in Quality and Fatty Acid Composition of Black Mussel (Mytilus galloprovincialis)     

Deyan Stratev  Teodora Popova  Georgi Zhelyazkov  Ivan Vashin  Lilko Dospatliev  Elitsa Valkova 《Journal Of Aquatic Food Product Technology》2017,26(7):871-879

The study was designed to assess the seasonal variations in the quality and lipid profile of mussel meat (Mytilus galloprovincialis) harvested along the Bulgarian coast of the Black Sea. The trial period lasted from June to October, and the sampling was carried out in the area of Varna Bay. Technological quality of the mussels was determined by measuring the water holding capacity (WHC) and cooking and roasting losses. Proximate composition, total aerobic plate count, and fatty acid analysis were carried out. Technological parameters and nutritional quality of the mussel meat were strongly affected by the season. During the summer, the mussels had higher mass, meat content, and meat yield (p < 0.001) compared to the early autumn, which corresponds to the lowest protein content during this season. Lipid profile showed seasonal variations in both individual and total fatty acid amounts (p < 0.001). Saturated fatty acids (SFA) had the highest content in summer, while monounsaturated fatty acids (MUFA) decreased gradually until the autumn. The content of polyunsaturated fatty acids (PUFA) reached its peak in October, contributing to the most favorable values of the nutritional indices of lipids in the early autumn.  相似文献   

Neural network prediction of performance parameters of an inclined plate seed metering device and its reverse mapping for the determination of optimum design and operational parameters   总被引：2，自引：0，他引：2  

M. Anantachar  T. Guruswamy 《Computers and Electronics in Agriculture》2010,72(2):87-98

Seed planting equipment with inclined plate seed metering devices is the most commonly used equipment for planting of peanut crop in India. For obtaining the high yield, it is very essential to drop the peanut seeds in rows maintaining accurate seed rate and seed spacing with minimum damage to seeds during metering. This mainly depends on forward speed of the planting equipment, rotary speed of the metering plate and area of cells on the plate. The relationship between these factors and the performance parameters viz., seed rate, seed spacing and percent seed damage can be established using regression analysis. But they may not be very accurate and may pose difficulty in the determination of inputs for a set of desired outputs (reverse mapping). Hence, an attempt has been made in this paper to develop the feed forward artificial neural network (ANN) models for the prediction of the performance parameters of an inclined plate seed metering device. The data were generated in the laboratory by conducting experiments on a sticky belt test stand provided with a seed metering device and an opto-electronic seed counter. The generated data was used to develop both statistical and neural network models. The performance of the developed models was compared among themselves for 4 randomly generated test cases. The results show that the ANN model predicted the performance parameters of the seed metering device better than the statistical models. In order to determine the optimum forward speed of the planting equipment, peripheral speed of the metering plate and the area of cells on the plate to obtain the recommended seed rate of 33.33 seeds/m², seed spacing of 100 mm and percent seed damage of 0.2% with 100% fill of the cells, a novel technique of reverse mapping using ANN model was followed. It was observed that the optimum forward speed of the planting equipment and optimum area of cells on the metering plate had good correlation with size of seed. Linear regression equations were developed to predict the optimum forward speed of the planting equipment and optimum area of cells on the metering plate using the size of seeds as independent parameter. The peripheral speed of the metering plate of 0.237 m/s was found to be optimum for the size of seeds in the range of 95.42-123.01 mm². However, the results need to be verified by conducting planting operation under actual field conditions.  相似文献   

Inhibition of nitric oxide enhances ovine lentivirus replication in monocyte-derived macrophages     

Keane KA  Mason GL  DeMartini JC 《Veterinary immunology and immunopathology》2002,90(3-4):179-189

  相似文献   

Protein extraction from defatted wheat germ by reverse micelles: Optimization of the forward extraction   总被引：4，自引：1，他引：3  

Xiao-Hong Sun  Ke-Xue Zhu  Hui-Ming Zhou   《Journal of Cereal Science》2008,48(3):829-835

In this work, the forward extraction of defatted wheat germ protein (DWGP) by reverse micelles was studied. The reverse micellar systems were formed by sulphosuccinic acid bis (2-ethylhexyl) ester sodium salt (AOT), isooctane and KCl solution. The effects of AOT concentration, pH, KCl concentration, extraction time, the amounts of defatted wheat germ flour (DWGF), W₀ (the molar ratio of water to surfactant, i.e. W₀ = [H₂O]/[AOT]) and temperature on the forward extraction efficiency of DWGP were tested. On the basis of single-factor experiments, the optimum extraction was achieved by response surface methodology (RSM). The experimental results lead to the conclusion that the highest forward extraction efficiency of DWGP was reached at the AOT concentration 0.06 g/mL, pH 8, KCl concentration 0.1 mol/L, time 30 min, the amounts of DWGF 0.500 g, W₀ 25 and temperature 36 °C. Under these conditions, the forward extraction efficiency of DWGP achieved 37%.  相似文献   

南方春大豆不同播季主要农艺性状的变化及其遗传研究   总被引：4，自引：0，他引：4  

马继凤  赵政文 《大豆科学》1998,17(4):331-339

本文以１２个南方春大豆早熟品种（系）和１２个中熟品种（系）为材料，进行春，秋播试验，研究主要农艺性状的秋播变异率，遗传变异系数，遗传力和遗传进度，结果表明：１，两熟期组秋播变异率平均，除分枝起点为负值以外，其它１１个性状在２．３６％－５２．８８％之间，说明秋播对为结性状均有一定影响；熟期组之间各性状秋播变异率的大小亦存在较大差异，如秋播对早熟组株高，主茎节数，结荚节数，结荚高度，主茎荚数和百粒重的  相似文献   

基于逆向物流的产品退货管理研究   总被引：1，自引：0，他引：1  

丛晓琪  杨怀珍 《安徽农业科学》2007,35(30):9731-9732

阐述了逆向物流产生的原因和概念,分析了逆向物流与退货管理的关系,从再制造、再利用、修理、再生、回收、再销售六方面对逆向物流的价值进行分析。对退货逆向物流形成的原因进行了分析,并对退货逆向物流管理策略进行了研究。  相似文献   

A split-root apparatus for examining the effects of hydraulic lift by trees on the water status of neighbouring crops   总被引：1，自引：0，他引：1  

I. Hirota  T. Sakuratani  T. Sato  H. Higuchi  E. Nawata 《Agroforestry Systems》2004,60(2):181-187

We describe a split-root system for examining the effects of hydraulic lift by trees on crop growth. In this system, upper lateral tree roots were grown in a container set on the ground through which the taproot of the tree could penetrate into the moist soil below. The container, with a radius of 0.5 m and a height of 0.20 m, consisted of two compartments divided by a waterproof barrier. A markhamia tree (Markhamia lutea (Benth.) Schumann) and upland rice (Oryza sativa (L.)) plants were planted in one compartment, with only rice plants planted in the other compartment. Irrigation of the container was ceased at the start of the experiment. The stomatal conductance of the rice plants in the associated side, in which both trees and rice plants were grown, declined more rapidly during the first drying period than in the rice-only compartment, suggesting that there was competition for water between the tree and the crop plants. However, during the later drying period, the rice plants in the associated side were green and viable, while those in the rice-only side became desiccated. Rice roots were seen intermingling with tree roots, and the soil water content in the associated site tended to be higher than in the rice-only side. It is likely that hydraulic lift occurred in the associated side and that water that had been transferred to the surface roots was released into the soil, enabling the rice plants in this compartment to remain viable. This novel system is useful for examination of the effects of hydraulic lift by trees on the growth of neighbouring crops. This revised version was published online in June 2006 with corrections to the Cover Date.  相似文献