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Gansu Agricultural University (2005)

The Effect on Soil Organic Nitrogen under the Different Tillage in Dryland

Jiang Xiao Feng

Titre : The Effect on Soil Organic Nitrogen under the Different Tillage in Dryland

Auteur : Jiang Xiao Feng

Grade : Master 2005

Université : Gansu Agricultural University

Résumé
1 straw mulch in dryland no-tillage on soil organic nitrogen components, the results show that : soil organic nitrogen in the form of amino acid nitrogen in a dominant position in the NTS, TS processing of soil organic nitrogen distribution in descending order : amino acid state nitrogen gt ; hydrolysable unidentified nitrogen gt ; ammonia nitrogen gt ; amino sugar N ; the NT T in distribution of organic nitrogen in the order : amino acid nitrogen gt ; ammonia nitrogen gt ; the acid hydrolysis unknown nitrogen gt ; amino sugar N 2 simple no-tillage, the average content of organic total nitrogen varying degrees of coverage can increase soil acid solution. In farming measures 0-5cm soil, NTS and NT treatment were higher than the corresponding TS and T, in the 5-10cm of soil, NTS lower than TS, NT is still greater than T ; cover measures 0-5cm 5-10cm of soil, NTS and TS are higher than the NT and T. Grow crops, soil acid solution the organic total nitrogen did not change a lot, the T NT there is a decreasing trend, NTS, TS there is an increasing trend. 4 multiple comparisons the :0-5cm soil treatment, soil acid solution of organic TN Sort : NTS gt ; TS gt ; NT gt ; T, NTS and T between the significant difference, the remaining difference was not significant. 5-10cm of soil, soil acid solution organic nitrogen Sort : TS gt gt ; NTS ; NT gt ; T significant difference between TS and T, the remaining difference was not significant. Conservation tillage can increase the topsoil soil acid solution of the average content of organic total nitrogen, topsoil NTS of total nitrogen increased by 17.18% compared with the control soil acid solution. 6 the soil acid solution of ammonia nitrogen average concentration values ??0-5cm soil after planting crops in March than in August fell by 11.91% ; 5-10cm soil layer average in March than in August fell by 10.58% ; multiple comparisons : 0-5cm soil The soil acid hydrolysis of ammonia nitrogen Sort : T gt ; NT gt ; TS gt ; NTS ; 5-10cm of soil, sorting : T gt ; NT GT ; NTS gt ; TS. Either the the WPW rotation sequence or PWP rotation sequence in the 0-5cm, the NTS and T difference significant, the remaining difference is not significant, 5-10cm, there is no significant difference between the entire. Tillage, cover can make the soil acid solution increase in the average content of amino acid nitrogen. Multiple comparisons : in the 0-5cm soil, whether the WPW This rotation sequence or PWP this rotation sequence, sort among the treatments : NTS gt ; TS gt ; NT gt ; NTS and 17.62% higher than T , the NTS and T differences significantly forward, the remaining differences are not significant with : 5-10cm of soil, the difference between the TS and T, the rest of the difference is not significant for sorting between each treatment : TS gt ; NTS gt ; NT gt ; T . 8 amino sugar N proportion of total nitrogen in the soil acid solution is small, ranged from 5.96% -7.03%, farming, covering all can make the soil acid hydrolysis of amino sugar nitrogen content increase. Multiple comparisons : 0-5cm soil layer the WPW rotation sequence, NTS, TS and T differences significant, the rest was no significant difference in the the PWP rotation sequence

Mots clés : No-tillage Straw mulch Soil organic acid hydrolysis of total nitrogen Amino acid nitrogen Ammonia nitrogen Amino sugar N

Présentation (Dissertation topics)

Page publiée le 4 octobre 2014, mise à jour le 10 octobre 2017