| 摘要: |
| 研完结果表明,楼土速效磷含量与其供磷量之间呈时数曲线关系,且对小麦供磷能力随着施氮水平的提高有所增长;塿土速效磷的校正系数并非常数,它同速效磷测定值之间的关系式为y=146.5e-0.02287x,据此提出的校正系数分级标准及供磷数量,可作为测土施肥的参数;塿土上小麦磷肥的经济效益,依土攘速效磷含量多寡而异,除速效磷含量丰富地块施磷无效外,在舍量极缺、缺、中等和较高地块上,利润最高的施磷量分别为亩施P2O56kg、4kg及2kg。 |
| 关键词: 陕西省 关中西部灌区 塿土 供磷能力 速效磷,校正系数 经济效益 |
| DOI： |
| 分类号: |
| 基金项目: |
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| THE ABILITY OF LOUTU S01L TO SUPPLY PHOSPHATE AND ECONOMIC RETURNS OF PHOSPHATE FERTILIZER IN THE IRRIGATED AREA OF THE WEST PART OF SHAANXI PROVINCE |
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| Abstract: |
| Research resu]ts show that there is a logarithmic curve between fast
phosphate contents in Loutu soil and phosphate supplies by the soil,and
that with an increase in N application,the ability to supply phosphate to
wheat can be improved.The calibration coefficient of fast phosphate in
Loutu soil is not a conotant,but the equation between calibration coefficient
and the determined values of fast phosphate is y=146.5e-0.02287x on the
basis of which the classification of standard of calibration coefficient and
amount of phosphate supplies can be used as the parameters to carry out soil
survey for fertilizer application.The economic returns of phosphate in wheat
fields with loutu soil are different in terms of amount of fast phosphate in
soil.Apart from the fact that there is no economic return in the fields rich
in fast phosphate,the highest economic returns of phosphate application are
6kg/mu,4kg/mu and 2kg/mu in the fields extremely deficient,deficient,midium and slight deficient in phosphate respectively. |
| Key words: shaanxi provine,the irrigated area of the west part of shaanxi province,Lou soil,phosphate supply ability,fast phosphate,calibration coefficient,economic returns |
