桑枝枯菌核病病原菌的生物学特性研究

从发病桑树上分离到桑枝枯菌核病病原菌的纯菌种 ,并对该菌的培养性状和生物学特性进行了调查和研究。结果表明 :桑枝枯菌核病病原菌适于在PDA培养基和桑叶汁培养基上生长 ,其生长温度范围为 8～ 30℃ ,最适生长温度为 2 0～ 2 5℃ ,生长pH值范围为 1～ 12 ,最适生长pH值为 5～ 8,菌丝与菌核的生长情况大致相同 ;菌核在适宜的温湿度条件下能够产生子囊盘和子囊孢子 ,子囊孢子椭圆形 ,大小 7～ 14 μm× 3～ 7μm。     

影响牛精子体外获能的因素

本文针对牛胚胎体外生产的关键技术环节体外受精，从温度、卵母细胞、公牛个体、培养液组成、渗透压及pH值等方面阐述了影响牛精子体外获能的因素。     

不同砧木伏令夏橙对土壤pH值的适应性

本试验研究了紫色土pH值对枳砧、红桔砧和香橙砧伏令夏橙吸收Fe、叶绿素含量、过氧化物酶活性以及植株生长的影响。结果表明,香橙砧最耐碱;红桔砧其次;枳砧最不耐碱;而耐酸性无大差异。其最适pH依次为6.2、5.7、5.7,pH8时的生长量相当最适pH时的84、50、38％。香橙很有希望在四川作pH>6.5的紫色土柑桔园的砧木。pH4时的生长量依次相当最适pH时的74、71、67％,枳仍是酸性土壤的最优砧木。     

影响脲醛树脂胶粘剂性能的因素分析

对影响脲醛树脂胶粘剂质量的主要因素如摩尔比，pH值，反应温度，反应时间及原料质量等进行了分析，评价并提出最佳控制参数。     

花生硫素营养特性的研究

对花生的硫素营养特性进行了研究 ,结果表明 :施硫均能显著提高花生各生育阶段对N、S的吸收量 ,提高其N、S含量 ,降低N S比 ,提高花生盛花期以后的N积累比例 ,明显促进S养分向花生籽实部分运转。在不同硫肥品种中 ,以石膏促进花生吸收N、S,提高其N、S含量的效果最好。花生在始花～盛花期吸收硫的强度最大     

鱼源气单胞菌的主要特性研究

对分离于草鱼肠炎、白鲢鱼打印病、鲢鱼白皮病、草鱼烂鳃、鲤鱼体表出血感染及甲鱼败血症等病例的80株细胞进行了主要特性研究。结果表明均为气单胞菌属（Aeromonas)的细菌，其中嗜水气单胞菌（A.hydrophila)29株（占36．25％）、豚鼠气单胞菌（A.caviae)38株（占47．5％）、温和气单胞菌A.sobria）13株（占16．25％）。在被检验的病例中，或为其中一种气单胞菌的单独感染，或为两种、三种气单胞菌的混合感染。经做人工感染试验检查，表明这些分离菌均为相应感染症的致病菌。     

四棱豆开花特性的曲线方程配置研究

对四棱豆停止开花前的株高生长曲线进行了拟合,并对株高生长与开花数目变化进行了比较分析,采用logistic非线性生长模型对四棱豆开花特性进行了曲线方程配置.结果表明:曲线方程拟合度为0.990,能很好地体现四棱豆开花和生长特性,根据曲线方程计算得开花数目增加的拐点时间为出苗后的第99天,拐点花数目为70朵.     

Amending Soil with Sludge,Manure, Humic Acid,Orthophosphate and Phytic Acid: Effects on Infiltration,Runoff and Sediment Loss

Application of organic wastes to cultivated lands can replace mineral fertilizers but may also alter soil physical properties and enhance pollution potential. The objective of this study was to investigate the effects of biosolids [composted manure (MC) and activated sludge (AS)] and specific biosolid component [orthophosphate (OP), phytic acid (PA) and humic acid (HA)] application on soils differing in texture [loamy‐sand (Ramat‐HaKovesh, RH), loam (Gilat, GL) and clay (Bet‐Dagan, BD)], infiltration rate, runoff volume and soil sediment loss. The soils were packed in erosion boxes (400 × 200 × 40 mm) and subjected to six consecutive simulated rainstorms, each of 186 mm deionized water. The results showed that runoff volume and sediment loss from untreated soils increased with increasing clay contents. In treated soils, the response to AS application differed from the response to other amendments; in the BD clay and GL loam, it was the only amendment that caused a decrease in sediment removed by runoff. In the RH loamy‐sand, all amendments reduced the final infiltration rate, but only AS and HA increased the measured runoff. It is proposed that the difference in the response of the soils to the amendments is associated with the soil's ability to attenuate changes in the negative charge on the clay edges following the increase in the specific adsorption of charged anions, thus controlling clay swelling and maintaining aggregate integrity. The effects of amending soils with a source of organic matter in order to control runoff and soil erosion are not straight forward and depend on soil and amendment properties. Copyright © 2015 John Wiley & Sons, Ltd.     

Growth Responses of Twelve Wheat Cultivars and their Phosphorus Utilization from Rock Phosphate

Growth responses of 12 wheat cultivars and their phosphorus utilization were studied in a greenhouse. They were grown for 18 days in a solution containing rock phosphate as the phosphorus (p) source. Biomass of 26 day old plants of all the cultivars varied significantly whereas their shoot to root ratio stayed constant. The dry matter yield of all the 12 cultivars was significantly correlated with the p uptake (r = 0.74). Whereas the higher p uptake by all the cultivars was significantly (P < 0.01) related to the drop in the root medium pH, which was presumably owing to the H⁺ efflux from their roots. The wheat cultivar Blue Silver proved to be the most efficient p user and therefore seems to have the highest potential of making best growth in soils with poor p availability among the 12 wheat cultivars under investigation.     

Research on Material Delivery BOM Model Based on Technical Processing

在单因素试验确定的食盐添加量(A)、发酵温度(B)、发酵时间(C)、接种量(D)各较优化工艺参数的基础上进行4因素3水平正交实验,以pH值为指标,并兼顾产品品质,综合分析后确定4因素最佳工艺条件为:A1B2C2D3,即采用食盐添加量为2%,发酵温度为30℃,发酵时间为22 h,清酒乳杆菌3%接种量.