四个环渤海湾产区主栽软肉型品种葡萄规范性贮藏保鲜技术

介绍巨峰(Kyoho)、玫瑰香(Muscat Hambury)、龙眼(Longyan)和泽香(Zexiang)四个环渤海湾产区主栽软肉型品种葡萄的果穗果实特征特性及贮运特征特性,提出这四个品种葡萄的规范性贮藏工艺技术和独特保鲜技术,旨在为我国环渤海湾产区主栽软肉型品种葡萄的产业化贮藏保鲜提供技术支持。

台州地区厚皮甜瓜品种筛选试验

为筛选出适宜浙江台州地区设施栽培的优质厚皮甜瓜品种,作者以东方蜜1号和玉姑为对照,以5个脆肉型、4个软肉型厚皮甜瓜品种为试验材料,开展了品种比较试验。试验结果表明,脆肉型厚皮甜瓜浙甜105早熟,植株长势较旺,抗性中等,果实一致性好,中心糖度高达18.1%,每667 m^(2)产量为2673 kg,田间留果时间长且品质受影响小,可作为台州地区厚皮甜瓜的主推品种引进推广种植;脆肉型厚皮甜瓜丰登蜜25植株长势较旺、抗病性较好、结果能力强、产量较高,脆肉型厚皮甜瓜红脆蜜2号植株长势较旺、抗病性强、中心糖度17.2%、口感较好,可进一步引进推广种植;软肉型厚皮甜瓜美奥105表皮光滑,商品一致性好,可小面积推广种植。

An integrated project of fish and broiler： SIS model with optimal harvesting

The paper analyzes the influence of a susceptible-infectious-susceptible （SIS） infectious disease affecting both fish and broiler species. The paper also considers a joint SIS project of fish and broiler in which the growth rates of both species vary with available nutrients and environmental carrying capacities of biomasses. The nutrients for both species are functions of the biomasses of the two species. The harvesting rates of fish and broiler depend linearly on common effort function. It is assumed that the diseases are trans- mitted to the susceptible populations by direct contact with the infected populations. Using the medicine, some portion of the infected populations are transmitted to the sus- ceptible populations. The existence of steady states and their stability are investigated analytically. The joint profit of the SIS model is maximized using Pontryagin＇s max- imum principle and corresponding optimum harvesting rates are also obtained. Using Mathematica software~ the models are illustrated and the optimum results are obtained and presented in tabular and graphical forms.