Mid-storage and pre-sowing seed treatments for lettuce and carrot

Mid-storage hydration-dehydration treatments with medium-vigour lettuce seed very effectively reduced physiological deterioration in storage and ultimately showed better field emergence and final yield. Soaking-drying treatment of high-vigour lettuce seed was not effective. Pre-sowing treatment of medium-vigour lettuce seed, though less effective than mid-storage treatment, gave better field performance, but high-vigour seed did not benefit from the treatment. For carrot, both mid-storage and pre-sowing seed treatments proved beneficial, with the former showing better performance than the latter. Unlike lettuce, well-preserved carrot seed responded positively to the pre-sowing treatment.     

猪场废水的生物处理技术及其效果

规模化养猪场所产生的废水污染，已成我国农村面临污染的重要来源。针对这种污染，近年来出现了多种养猪场废水处理法，其中研究和应用最广的是生物处理法。本文通过对目前国内猪场废水生物处理法的现状分析后认为：用生物处理法处理猪场废水是今后猪场废水处理的发展方向；而生物处理法自身的发展方向是混合处理法；计算机和生物工程技术将进一步与生物处理法相结合运用于猪场废水处理。     

马传贫驴白细胞弱毒疫苗株跨膜蛋白主要免疫决定区基因的克隆与表达

从感染驴白细胞的马传贫驴白细胞弱毒疫苗株前病毒DNA中克隆了编码跨膜蛋白主要免疫决定区(TMIR)的基因，并在大肠杆菌中进行了表达。所表达的融合蛋白有一部分是可溶的，其氨基端带有6个组氨酸的标签，因此可以用固定化金属离子亲和层析法在非变性条件下进行纯化。在间接酶联免疫吸附试验(ELISA)和免疫印迹试验中，重组的TMIR蛋白可与马传贫阳性血清样品发生反应，而与健康马血清无任何反应。这表明该重组蛋白具有良好的抗原性和特异性，可用于马传贫弱毒疫苗株在体内外复制、接种马体内免疫应答及马传贫诊断的研究。     

桑苗圃和桑园的化学除草

用氟乐灵和精稳杀得或高效盖草能进行桑苗圃除草，用草甘磷和乙草胺混合进行桑园除草，可有效地防除杂草。     

Study on Site-specific Nutrient Management in Cotton Field

The study on the characteristics of spatial variability of soil nutrients and fertilizer recommendations in cotton field under certain conditions of agricultural management was conducted with GIS and systematic approach for soil nutrient constrains. The results showed that of the spatial variability of soil nutrient was greatly related to the management condition of previous crops. Grid sampling and variable rate application technology (VRAT) were the tools that would hopefully increase fertilizer efficiency. The fertilizers were applied where they were needed and at proper rate. Balance fertilization demonstration showed that fertilizer recommendations according to the available nutrient level in soil could decrease fertilizer cost with 657.4 yuan / ha and increase seed cotton yield by 19.8%. A net profit of the balanced fertilization was 5314.9 yuan / ha higher than that of local fertilization practice.     

The Effect of Detopping the Field Bean Plants (Vicia faba L. minor) and Lack of the Pod Setting on the Symbiosis with Root Nodule Bacteria

The plants of field bean var. Nadwiślaνski were detopped after about 1 month since the beginning of flowering and after that all flower buds were removed from some plants. The effect of a change in the trophic balance on the setting and subsequent growth of root nodules was studied.
The removal of pods had the greater effect on the increase in the weight of the remaining organs than the detopping of plants. Detopping retarded the ageing of the plants and delayed the phase of the greatest reduction of the number of pods. The detopping of plants revealed their considerable compensative possibilities in terms of production of the pod weight and the potential of leaves for biomass production. The data obtained indicate that plant detopping may disturb the root–bacteria exchange of signals, necessary to initiate the nodule development, while the further growth of nodules depends, above all, on the amount of available photosynthates.
A very high correlation between the dry weight of the whole plant to the dry weight of leaves ratio and the weight of nodules was observed. It proves the importance of the trophic balance of the plant for the root nodule weight production.     

金针菇品种比较试验

１９９１年１０月至１９９３年７月，笔者用Ｃｏ－２７等１２个菌株做了四批十二次金针菇品种比较试验，菌株Ｃｏ－２７比优良品种三明一号，Ｆ９０８分别增产１４．２６％和１２．３９％，差异显著性测验表明，它们之间的差异均达到了显著程度；Ｃｏ－２６，Ｃｏ－１４，Ｃｏ－２３，Ｃｏ－１５，Ｃｏ－２４，Ｃｏ－１３等菌株与两个对照品种相比，其产量都有不同程度的提高，除Ｃｏ－２５之外，各菌株之间菌丝生长速度没有表现出显     

乙草胺防除辣椒田杂草的药效试验

50 %乙草胺EC 12 0 0、15 0 0ml/hm2 在辣椒苗移栽前 1d对土壤用药 ,对辣椒安全 ,除草效果在 75 .0 %～ 82 .6 %之间 ;乙草胺对禾本科杂草的防效好于阔叶草     

香菇“9101”菌株选育研究报告

1991－1998年从长白山采集的野生香菇子实体中，通过分离、筛选、生物学测定、出菇试验、品种对比试验等方法，选育出适合吉林省气候条件的香菇菌株－9101。“9101”属于低温型菌株，生育期约160d，有效积温3200℃，中晚熟种，出菇中心温度7－18℃，适合北方地区代料栽培，也可用于段木栽培。