新型肥料改变中国农业模式

来源 :中国农业信息 | 被引量 : 0次 | 上传用户:intel20107
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
中国以占世界9%的耕地用去了世界1/3的化肥,单位面积用量是世界平均水平的3.7倍,环境与生态压力很大。庆幸的是,新型肥料正慢慢成为肥料行业发展的趋势,在国内迎来全面发展的最佳机遇期。新型肥料有别于传统的、常规的肥料。能够直接或间接地为作物提供必需的营养成分;调节土壤酸碱度、 China uses 9% of the world’s arable land to consume 1/3 of the world’s chemical fertilizers. Its unit area is 3.7 times that of the world average and its environment and ecology are under great pressure. Fortunately, the new fertilizer is slowly becoming the trend of the fertilizer industry, ushered in the best opportunities for all-round development in China. The new fertilizer is different from the traditional, conventional fertilizer. It can provide the crops with essential nutrients either directly or indirectly; adjust soil pH,
其他文献
与生理盐水相比,等渗镁对醋甲胆碱及组胺引起的支气管狭窄具有抑制作用,且血清镁水平持久增加可通过β2受体亲和力的增加而增强沙丁胺醇的支气管扩张作用。本研究的目的是测定
Objective: To compare IVF outcomes among women of different ethnic backgrounds. Method. This was a retrospective cohort study. Between August 1994 and March 199
OBJECTIVE: Hysterectomy is the most common major surgical procedure performed in the United States for nonobstetric reasons. Although most hysterectomies includ
唑仑膦酸 (zoledronicacid)的结构式如下 :检测了短期内唑仑膦酸酯 (zoledronate) 10 0mmol·L- 1单独使用或与他莫昔芬 (0 .0 1和 0 .1mmol·L- 1)或与紫杉醇 (2nmol·L- 1)合用作用于体外MCF7乳腺肿瘤细胞的效应。用唑
患者女,29岁,已婚1年半,无避孕措施,月经规则,从未生育,孕0产0,过去史无特殊.停经63 d就诊,尿液妊娠试验阳性,未出现不适.阴道实时超声检查子宫内未见孕囊,子宫内膜厚约8 mm,探及右卵巢旁21 mm混合性块物,多普勒提示周围血流较丰富,疑为"右输卵管妊娠",收治住院.间隔48 h后,化验血清β-人绒毛膜促性腺激素(β-hCG),由2150 IU/L上升到2980 IU/L,孕酮15 ng
OBJECTIVE: To assess risk factors for legal induced abortion related deaths. METHODS: This is a descriptive epidemiologic study of women dying of complications
OBJECTIVE: Elevated counts of nucleated red blood cells (NRBCs), as well as prolongation of pregnancy, have been suggested as predictors of adverse perinatal ou
城市学龄前儿童的营养状况如何?这是家长们关心的问题,也是有关部门人士所关注的问题。为此,某城市的医务人员深入到托儿所、幼儿园及家庭对这些儿童进行了调查和研究,共调
儿童期的背部疾病,差不多都是与运动或游戏中动作不熟练,或跌倒或意外牵拉以致受伤有关。这些损伤可能引起肌肉、韧带拉伤,血肿,出现疼痛和动作不灵活。这些症状通常不需特
A catalyst- and solvent-free protocol for the synthesis of 7-azagramine analogues is described via a three-component Mannich type reaction between 7-azaindole,