Microbial, Urease Activities and Organic Matter Responses to Nitrogen Rate in Cultivated Soil

Sun Jingjing,Zhu Mijia,Yao Jun,Yang Xiaoqia,Zhang Chi

doi:10.2174/1874070701509010014

Abstract

Nitrogen (N) fertilizer is an important field management, this paper was to investigate the responses of microbial activity measured by microcalorimetric technique, urease activity and organic matter to proper nitrogen (N) fertilizer in cultivated system in the North China Plain. The microcalorimetry results showed that microorganisms under proper N fertilizer rate got the efficient metabolism. The maximum heat production (Pmax) of microcalorimetry parameter implied that increasing the N fertilizer rate, Pmax did not increase always but firstly increased than decreased. In addition, from soil urease activity and organic matter studies, high soil urease activity due to both N fertilizer rate and growth stage and these had light influence on soil organic matter. These results suggest that only proper amount of N fertilizer rate and suitable topdressing for a good wheat-growing environment.

Highlights

Nitrogen (N) fertilizer application is an important measure to improve the soil fertility and crop yield [1], it is one of the most management measure in agriculture [2]
The values of QT had light difference at trough, reviving and jointing stages with increasing nitrogen fertilizer rate, but increasing nitrogen fertilizer rate that QT showed a trend of obvious W shape at blossoming stage and at maturing stage QT decreased with increasing nitrogen fertilizer rate
N0, N1, N2, N4 in jointing stage had the maximum time, and N3 had the maximum time in blossoming stage, N0, N1, N4 had the minimal time in blossoming stage, N2 in trough winter stage had the minimal time, N3 in reviving stage had the minimal time and each stage’ s time had little change. t which indicated the time of soil microorganisms metabolism in the whole process, in trough winter and reviving stage, no influence on N rate (Table 1), jointing stage had the longest time of t, blossoming stage used greater time of t than maturing stage except for N0,N1

Summary

Introduction

Nitrogen (N) fertilizer application is an important measure to improve the soil fertility and crop yield [1], it is one of the most management measure in agriculture [2]. The North China Plain is the most important grain-producing areas in China, two-thirds of China’s winter wheat come from here [5]. To study this area’s soil on different growth stages of winter wheat is extremely important, it is becoming essential to research the microbial activity, urease activity and soil organic matter under different N rates in winter wheat system. It will provide proper N availability, reduce the pollution of N on the environment play a guiding role

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Discussion

Conclusion