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水稻病虫害绿色防控技术示范 总被引:1,自引:0,他引:1
介绍了方正县水稻病虫害绿色防控示范的基本情况,总结了示范的主要组织措施和获得的多方面效益。示范区绿色防控集成技术包括农业生态调控、物理防治、生物防治、科学药剂防治以及专业化防治等。开展和实施水稻病虫害绿色防控,减少了农药用量、生产成本和环境污染,防治效率、防治效果和防治效益均有很大提高,保证了农业生产、农产品质量和农田生态环境安全,也给农民创造了实惠。 相似文献
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由于品种和气候等因素的影响,德化梨树主要病、虫害成为发展无公害德化梨生产的重要技术瓶颈.为及时做好梨树病、虫害的测报和防治,通过实地调查德化梨树主要病、虫害发生动态,总结提出以农业防治为基础,充分发挥生物防治,及时搞好预测、预报及科学、合理地进行化学防治等综合防治技术 相似文献
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W. L. Porter 《American Journal of Potato Research》1967,44(10):382-382
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Effects of timing and rate of N fertilizer application on concentrations of P, K, S, Ca, Mg, Na, Cl, Mn, Fe, Cu and Zn in herbage from perennial ryegrass/white clover pastures were studied at two sites in south-western Victoria, Australia. Nitrogen fertilizer (0, 15, 25, 30, 45 and 60 kg ha–1 ) was applied as urea in mid-April, early May, mid-May, early June and mid-June 1996 to pastures grazed by dairy cows. At Site 1, N fertilizer resulted in a linear increase in P, K, S, Mg and Cl concentrations in herbage and a linear decrease in Ca concentration. For all times of application, concentrations of P, K, Ca, Mg and Cl in herbage increased by 0·0048, 0·08, −0·010, 0·0013 and 0·053 g kg–1 dry matter (DM) per kg N applied respectively. For S concentration, maximum responses occurred in mid-May (0·012 g kg–1 DM per kg N applied). At Site 2, N fertilizer resulted in a linear increase in P, S and Na concentrations in herbage, a linear decrease in Ca concentration and a curvilinear increase in K and Cl concentration. The maximum responses for P, S and K concentrations in herbage occurred for the N application in mid-June and were 0·015, 0·008 and 0·47 g kg–1 DM per kg N applied respectively. For Cl concentration, the maximum response occurred for the N application in early June and was 0·225 g kg–1 DM per kg N applied. Overall, applications of N fertilizer up to 60 kg ha–1 did not alter herbage mineral concentration to levels that might affect pasture growth or animal health. 相似文献
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Krishna Kumari S Thayumanavan B 《Plant foods for human nutrition (Dordrecht, Netherlands)》1998,53(1):47-56
Scanning electron microscope (SEM) pictures of small millet starch granules showed more large polygonal and few small spherical or polygonal granules. The granules of small millets resembled those of rice starch granules. The size of the starch granules ranged from 0.8–10 m. The size of the granules was larger in barnyard millet and smaller in proso millet. Several granules showed deep indentation caused by protein bodies. SEM of starch isolated from 24 hour-germinated kodo millet showed pitting or pinholes at some points due to the attack of amylases (preferentially on bigger granules). Brabender viscoamylograph studies on small millet starches revealed that the gelatinization temperatures ranged from 75.8 to 84.9 ° C. Barnyard millet possessed lower amylograph viscosity, minimum breakdown, and relative breakdown values when compared to the other small millets. 相似文献