国外松芽流脂病发生与防治

近年来,浙江省局部地区国外松纯林受芽流脂病危害较为严重.通过定点现察、分离培养、光镜检查、电镜现察、微量元素测定和用硼砂防治罹病松树等方法,基本查清国外松芽流脂病在浙江省的发生情况,明确了国外松芽流脂病的3种症状顶芽枯死型、丛枝型和枯梢型.国外松芽流脂病是由于松树自身和土壤中的微量元素--有效硼含量不足引起的生理性病害.用喷洒3.0g@kg-1或5.0g@kg-1硼砂溶液防治该病效果显著,防治区病情指数与对照相比平均下降38.5,松树的年平均高生长量也比对照大14.8cm.表4参4     

空中核爆炸对水稻的损伤及其恢复

在空中核爆炸的情况下,光辐射是损毁水稻的主要因素,光辐射可使三叶期、分蘖期水稻的叶片烧损、株高降低,其损毁程度随着距爆心距离的加大而减弱,叶片受到烧损仍然存活的植株,爆后可迅速恢复生长,叶片数、株高在较短时间内即可达对照水平,分蘖能力也不受影响。收获时大部分受损水稻的穗长、穗粒数、千粒重、平均单株分蘖数、     

青饲牧草地化学除草试验报告

对６种青饲牧草用７种除草剂进行除草试验。证明播后苗前墨西哥类玉米用４０％阿特拉津胶悬剂０．９０ｋｇ（ａｉ）／ｈｍ＾２；Ｍ－８１Ｅ饲用高粱与串叶松香草适宜用６０％丁草胺乳油０．９０ｋｇ（ａｉ）／ｈｍ＾２；苏丹草适宜用６０％丁草胺乳油０．９０ｋｇ９ａｉ）／ｈｍ＾２与２５％绿麦隆可湿性粉剂０．９４ｋｇ（ａｉ）／ｈｍ＾２，紫苏用１２％恶草灵乳油０．２７ｋｇ（ａｉ）／ｈｍ＾２与８４％ｃｈｉｎｃｈ乳油１．８９     

蒜地杂草的化学防除（上）

论述了我国蒜地除草剂应用概况，华东地区蒜地杂草有２０科５４种，组成５种不同杂草种群生态区。蒜草醚、旱草灵、乙草胺、恶草灵等对不同品种大蒜的安全性测定结果，蒜草醚、恶草灵、旱草灵安全系数４，乙划是胺，大惠利安全系数为２，嘧黄隆不可在大蒜地应用。     

盈江县沙化土地的综合治理

山高坡陡，切割强烈；降水丰富，降水年内分配不均；土层深厚，土体疏松等是盈江县沙化土地形成的主要自然因素。森林植被遭到破坏，坡耕地面积逐年增加等是盈江县沙化土地形成的主要人为因素。盈江县现有沙化土地面积2520.5hm^2，有流动沙地、兰固定沙地、固定沙地、沙改田4个沙化土地类型。通过长期的治理，沙化土地各类型面积及利用状况发生明显变化，总体发展趋势呈现逆转，沙化土地得到有效利用。今后需以治理水土流失为中心，采取生物措施、工程措施、农业措施相结合，开发利用并举的综合治理措施。     

Attempts at Preventing Further Spread of Bovine Virus Diarrhoea Virus (BVDV) Infection in 5 Danish Dairy Herds in which BVDV had been Isolated

In 5 herds in which bovine virus diarrhoea virus (BVDV) had been isolated, all animals were bled for virological and serological examination. After the herd blood test, follow up blood tests were made on calves born up to 6 months later in 1 herd, 9 months later in 1 herd and up to 12 months later in 3 herds. Persistently infected animals (PI animals) were removed and after a time period a small herd sample of 10 animals that were born after removal of the PI animals were examined for BVDV antibodies.At the herd blood test a total of 21 PI animals were detected. During the follow up period another 25 PI animals were born.Among animals in the small herd samples collected after removal of the PI animals, antibody positive animals were found in the 2 herds with the shortest follow up period. In the 3 herds with a 1 year follow up period there were no antibody carriers in the herd sample.It seems possible to prevent further spread of infection with BVDV if all animals in the herds as well as animals born during the following year are examined and PI animals removed.     

日光温室光周期控制器的设计

本文设计了一种用于日光温室的光周期控制器 ,解决了日光温室自动化光照的问题。该设计采用数字电路 ,光电传感器 ,电光源 ,实现了对白天光照接续的时间和晚间增补光照的时间的自动、准确的控制     

控制工程造价不是盲目压价

本文对工程造价管理角度进行了论述,从不同的角度分析了控制工程造价的方法,阐明如 何科学地控制工程造价。     

畜牧业生产中的环境污染及治理对策

本文阐述了畜牧业生产中产生的畜禽粪尿、有机废水等废弃物对环境造成的污染，探讨了治理畜牧业污染的措施，提出了发展生态畜牧业的思路。     

山地橄榄主要病虫害种类及其防治措施

介绍了山地橄榄2种病害：叶斑病、炭疽病；5种虫害：橄榄星室木虱、黑刺粉虱、恶性叶甲、橄榄枯叶蛾、橄榄野螟的主要特征和危害症状，并提出了防治措施。