水稻缩苗病的起因与防治技术

针对新民地区近年在增施磷肥条件下,水稻缩苗病不断发生的实际问题,开展试验研究。结果表明,增施锌肥可使缩苗病情得到缓解,并有显著增产作用。同时,分析了缩苗病的发生机理,提出了防治技术措施。

锌、锰微肥防止麦茬稻旱种缩苗病的探讨

麦茬旱种稻区历年有不同程度的缩苗病发生,由此影响生长和产量。本试验采用锌、锰微肥底施、拌种、喷施,结果均对防治麦茬旱种稻缩苗病和增产效果明显,尤以底施和拌种效果更佳,其增产率达10%以上。

拓荒土壤和缩苗病的发生及防治技术

拓荒种稻是充分利用土地资源的重要措施，但由于贫锌、pH值偏高，使第一年水稻缩苗病严重发生，产量低，影响经济效益，本试验采用不同的施锌肥方法和补救措施，结果对防治拓荒地稻缩苗病和增产效果十分明显，采用本试验3处理，补救了大面积稻田，使水稻产量比上年提高2～3倍。

Preparation of Purified and Inactivated HP-PRRS Vaccine

[Objective] The aim of this study was to improve the purification and protective potency of HP-PRRS inactivated vaccine. [Method] HP-PRRS virus that had been multiplied inside Marc-145 cells was collected and concentrated 50 times and then inactivated. Complete virions were separated and collected by chromatography with Sepharose 4 Fast Flow. Oil adjuvant was added to prepare purified inactivated vaccine. [Result] Viral protein was separated from other proteins by purification and the viral protein contents ranged from 76.7% to 82.4%, and 96% of the expected serum proteins were removed. Protective potency of purified vaccine was above 4/5 and positive conversion rate of antibody was over 86%, both higher than that of unpurified vaccine. The differences were significant. [Conclusion] The experiment il-lustrated that the immune efficacy of vaccine can be enhanced through concentrat- ing and purifying, while the non-viral protein can be removed, so that allergic reaction and stress response cadsed by vaccine inoculation can be avoided.

水稻喷施绿喷灵效果好

我镇有稻田面积１０万亩，１９９８年推广施用绿喷灵叶面肥，取得了较好的效果。育秧前用绿喷灵拌种。取５０克绿喷灵加水１公斤，拌稻种１０公斤，晾干后播种。结果，拌绿喷灵的比对照出苗早０５天；立针期种子根比对照多０５～１条，根长比对照长１～１５厘米，根...