共查询到20条相似文献,搜索用时 140 毫秒
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包裹肥料是我国复混肥生产中的一项专利技术 ,通过特殊的造粒工艺和原料配方 ,将尿素、重钙、氯化钾包裹成粒。该肥料施入土壤后 ,肥料中的速效氮、磷、钾素能持续缓慢地释放出来 ,既有利于作物吸收利用 ,又减少了养分的挥发和淋溶损失 ,从而提高了肥料养分利用率。同时还含有一定量作物生长必需的铁、钙、镁、硅、锰等多种微量元素 ,对作物生长具有良好的作用。小麦包裹专用肥 ,由于在生产时将尿素、重钙、氯化钾包裹在中间 ,肥料施入土壤后 ,粒肥表面的包衣溶解以后才能发挥肥效 ,加上尿素在土壤中又有一个氨化阶段 ,所以苗期氮素供应不足… 相似文献
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专用肥料分析式,是生产农业专用肥料的依据。它是根据作物需要养分、土壤提供养分状况及化肥利用率三个重要因素而设定的计算式,用以确定氮、磷、钾比例及配合一定量微量元素而生产专用肥料。 相似文献
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介绍了中科院学部咨询评议项目"我国化肥使用中存在的问题与对策"及香山科学会议第526次学术讨论会"建立绿色的肥料保证体系的关键问题",以了解国内肥料业关注的问题;在国际上普遍关心的是由于长期仅重视氮磷钾的施用而补充的中微量元素不足致使作物品质普遍下降,影响人类健康,作物对自然的抗性降低。介绍了以人类为核心的中微量元素观,及补充能增强作物抗性的中微量元素的重要性。 相似文献
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新型肥料技术发展趋势 总被引:2,自引:0,他引:2
论述研发新型肥料应从大批量、共性化生产转向个性化、专用化方向发展;应根据不同土壤、不同作物的需肥规律来开发新型肥料;要大力发展木质素磷肥和控释肥、群落专用肥、微量元素控释肥;指出新型肥料要与科学的施肥系统相配套才能增产增收。 相似文献
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中国氮肥消费状况及其发展展望 总被引:10,自引:0,他引:10
中国氮肥的消费在经历了快速的波动性增长以后,近年来的增长趋势变慢。通过对全国农技中心2003年统计数据和2000年农户调查数据的分析,阐明了我国氮肥消费的空间分布、品种结构和农作物需求状况;并指出了农作物氮肥施用中存在传统施肥习惯影响氮肥消费结构,氮肥施用面积不足、适量和超量各占三分之一,施肥方式影响肥料利用率,氮肥价格的上涨也影响氮肥消费结构等问题。因此,中国氮肥总消费量增长的趋势并不明朗。目前开展的测土配方施肥行动和减少氮肥农田损失的措施都会不同程度地影响未来氮肥的消费结构。 相似文献
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有机农业不应排斥化肥 总被引:2,自引:0,他引:2
阐述了有机农业、绿色农业不应排斥化肥的原因。合理施用化肥不仅可使农产品增产、改善品质,我国政府也大力倡导科学施肥,而且化肥支撑了增长人口的生存。如要继续科学高效地使用耕地,化肥仍将是重要物资;有机肥取代化肥尚待时日,难点较多;即使进入循环经济、未来社会,仍将会增加对肥料的需求,因此应尽快纠正有机农业等排斥化肥的状况。 相似文献
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有机中微肥在沃土工程建设中的作用 总被引:1,自引:0,他引:1
围绕沃土工程建设,分析了肥料的生产和应用中存在的“三重三轻”的问题。笔者认为:测土平衡施肥是沃土工程建设的关键;土壤营养元素的丰缺是肥料二次加工的理论依据;必需元素的有效性是优质配方肥料质量的重要指标;活性必需元素的生产成本是配方肥能否推广的重要因素;肥料生产企业应把提高肥料利用率作为研究的课题。有机中微肥在肥料生产,尤其是二次加工中扮演了重要角色,是沃土工程建设中必不可少的要素。 相似文献
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Nitrogen use per unit area in Egyptian agriculture is over 300 kg ha–1. An annual average increase of about 2% till year 2000 was estimated. Fertilizers use is characterised by excessive N application, moderate P use and neglection of K and micronutrients. Consequently, nutrient imbalance occurs in crop plants. Subsidising N fertilizers resulted in their misuse and increasing losses. Efficiency of N use in different areas and crops is low. High nitrate concentrations were detected in drainage as well as ground water. Subsidy was removed and fertilizers handling was left to the free market in 1992/93, which resulted in drastic price increases. It could be demonstrated for many years and in farmers fields that yields can be considerably increased (20%) through balanced fertilizers use based on soil testing and plant analysis and adjusted according to the prevailing farming system, leading to more return and less N-use. Use of micronutrients foliar fertilizers leads to increase in root growth and higher uptake of macronutrients. Use of relatively high rates of fertilizers is still a must, however it should be optimised to obtain the highest possible efficiency. Making crop and location specific fertilizer recommendations available to farmers helps in increasing high quality yields, which results in high economic benefits, keeping agricultural production sustainable and decreasing pollution. 相似文献
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化肥的大量施用不仅导致土壤硬化,而且造成了较大的经济损失和严重的环境污染.硅肥有利于促进作物生长和改善土壤环境,在农业生产中发挥着越来越重要的作用.介绍了一种新型水溶性硅肥的制备方法和应用效果,实践证明,水溶性硅肥能显著提高作物的产量、品质和抗倒伏性,施用效果良好. 相似文献
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生物有机肥料与农业可持续发展 总被引:16,自引:0,他引:16
阐述生物有机肥与农业可持续发展的关系,指出生物有机肥具有改良土壤,提高土壤肥力,改善土壤对植物NPK等营养元素的供给,提高植物抗病能力,减少植物病虫害,辅之秸秆还田,可减少农药使用量,促进农业良性循环,提高农产品品质等重要作用。 相似文献
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A field experiment was conducted with lucerne on a strongly acidic and phosphorus deficient soil to determine the liming and phosphorus and nitrogen fertilizer value of an undigested, lime-treated sewage sludge. The results are presented in terms of calculated combinations of lime, nitrogen and phosphorus fertilizer required to obtain the same lucerne yield (or soil pH or extractable phosphorus level) as achieved with 5 or 10 t ha–1 of dried sludge.The sludge was a good source of lime, phosphorus and nitrogen. The sludge phosphorus was 49% as effective as the fertilizer phosphorus in raising extractable phosphorus in the soil to the level required for crop growth. The calcium carbonate of the sludge raised soil pH more effectively than agricultural lime, probably because of finer particle size in the former.It was not possible to achieve the yield obtained with 25 t ha–1 of sludge with combinations of agricultural lime, and nitrogen and phosphorus fertilizers at high rates of application. This was attributed to the effects of the sludge on improving soil physical properties. 相似文献
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Recycling of nutrients in Japanese mint - assessment of soil fertility and crop yield 总被引:1,自引:0,他引:1
The efficiency of mint-residue, composted alone and amended with starter nutrients, microbial culture and soil suspension (hereafter termed amended compost) was compared with farm yard manure and inorganic fertilizer on the yield of Japanese mint (Mentha arvensis L.) and improvement of soil fertility. Herbage, essential oil yield, nutrient uptake of Japanese mint and soil available nutrients were significantly enhanced due to application of amended compost as compared to nonamended compost, farm yard manure and inorganic fertilizer. Organic fertilized soils maintained significantly higher available nutrients throughout the crop growth period as compared to inorganic fertilized soils. No additional improvement in yields and soil fertility was recorded with combined application of compost and inorganic fertilizer in 1:1 ratio as against addition of compost alone. Advantage of such combinations was recorded in case of farm yard manure. Results of the study suggested possibilities for nutrient recycling through composted mint-residue for supplementing the fertilizers requirement of Japanese mint. 相似文献