Abundance Index of Soil Nutrients and Ratio of Available Nitrogen to Available Phosphorus in Linwei District of Shaanxi Province

MA Wen-yong; CHANG Qing-rui

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Abundance Index of Soil Nutrients and Ratio of Available Nitrogen to Available Phosphorus in Linwei District of Shaanxi Province

- Abundance Index of Soil Nutrients and Ratio of Available Nitrogen to Available Phosphorus in Linwei District of Shaanxi Province
- Bulletin of Soiland Water Conservation Vol. 32, Issue 1, Pages: 106-110(2013)
- 作者机构：
  
  西北农林科技大学资源环境学院, 陕西杨凌,712100
- 作者简介：
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- Published：2013
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MA Wen-yong, CHANG Qing-rui. Abundance Index of Soil Nutrients and Ratio of Available Nitrogen to Available Phosphorus in Linwei District of Shaanxi Province[J]. Bulletin of Soiland Water Conservation, 2013, 32(1): 106-110.
DOI：

MA Wen-yong, CHANG Qing-rui. Abundance Index of Soil Nutrients and Ratio of Available Nitrogen to Available Phosphorus in Linwei District of Shaanxi Province[J]. Bulletin of Soiland Water Conservation, 2013, 32(1): 106-110. DOI：

摘要

在陕西省临渭区共化验分析土样4 108个

测定了土样的碱解氮、有效磷和速效钾含量

采用域法识别特异值并进行最优克里格插值

得到临渭区耕地养分含量基本情况。根据临渭区2007—2008年的小麦、玉米和棉花的田间肥效试验资料

制定出相应的土壤养分丰缺指标。结果表明

该区土壤碱解氮含量基本可以满足作物的生长需要

仅有0.09%耕地不能满足小麦生长需要

0.86%不能满足玉米和棉花的生长需要

但整体水平仍较低;有效磷含量水平低

尤其是下吉镇中部、官道乡东部、孝义镇北部、丰原镇西北部和东南部及阳郭镇西部;速效钾含量对小麦、玉米不存在缺乏问题;对棉花来说

阳郭镇的西部和北部稍显不足。该区土壤氮磷比值平均为4:1

比例严重失调。因此

对临渭区的耕地应做到合理增施氮肥、磷肥

以产定磷

以磷定氮

保证作物的良好生长。

Abstract

The present situation of soil nutrients〔include available nitrogen(AN)

available phosphorus(AP)and available kalium(AK)〕in Linwei District was investigated by analyzing soil samples collected from 4 108sampling sites and using domain method to identify the outliers and optimal Kriging interpolation.Meanwhile

the nutrient abundance index for wheat

corn and cotton was determined by the experimental datafrom 2007to 2008.Results indicated that the demand of crop growth for AN was nearly satisfied

exceptthat only 0.09%of cropland showed AN deficiency for the wheat and 0.86%of cropland

for corn and cotton.The content of AP was relatively low

especially in the middle of Xiaji Town

the east of GuandaoTown

the north of Xiaoyi Town

the northwest and southeast of Fengyuan Town and the west of YangguoTown.The demand of wheat and corn for AK was fulfilled but that of cotton was unsatisfied

especially inthe west and north of Yangguo Town.The mean ratio of AN to AP was 4:1

representing an imbalancestate.Therefore

it is necessary to increase the amounts of AN and AP through applying AP by specific yieldand applying AN by the applied AP.

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