Effects of Nitrogen on Contents of N,P,K in Crop and Soil under Rapeseed-Rice Rotation SystemChinese Full Text
LI Han-tao;WANG Qiao-lan;LI Qing-rong;HUAN Yi;LIN Ya-meng;ZHAO Zhu-qing;YANG Ye;Tianmen Station of Soil and Fertilizer;Military School of Economics;College of Resources and Environment,Huazhong Agricultural University;Faculty of Life Science and Technology,Kunming University of Science and Technology;
Abstract: Effects of Nitrogen Rates（0,90,180,270,360 kg/hm2） on contents of N,P,K in crops and soil were studied under field experiment with rapeseed-rice rotation system.Results showed that accumulation of N,P,K slightly changed in the early stages of rapeseed,but increased with N application rate.Accumulation of P firstly increased and then decreased after 180 d of direct seeding.P content was the highest of treatment 180 kg/hm2,but there were no significant difference with 270,360 kg/hm2.N content in rice increased with the treatment,but there were no significant difference between treatment 270 kg/hm2 and 360 kg/hm2.Content of P and K increased firstly then decreased.Treatment of 270 kg/hm2 was the highest among all the treatments.There was no obvious differences of content of K among the treatments of 180,270,360 kg/hm2.It is indicated that high amount of N application during rapeseed growth not only guaranteed the assimilation of N,P,K of rapeseed but also could ensure the N,P,K nutrition during rice growth on the condition that N application was appropriatly reduced.The balance of N,P,K was kept during the rotation cycle.All the soil N contented persist surpluses except the N0 treatment.The surplus of N,P,K increased with the application of N.Surplus of phosphorus of each treatment with same P and K input increased with the decrease of N inputs.P content in soil was deficient when treatment was N270 and N360.Potassium was deficient in each nitrogen rate.Surplus of K increased with the increase of N input.
Keywords：
nitrogen rates; rape-rice rotation system; nutrient accumulation; balance of farmland nutrient;
- DOI：
10.14088/j.cnki.issn0439-8114.2014.19.010
- Series：
- Subject：
- Classification Code：
S511;S565.4
- Mobile Reading
Read on your phone instantly
Step 1Scan QR Codes
"Mobile CNKI-CNKI Express" App
Step 2Open“CNKI Express”
and click the scan icon in the upper left corner of the homepage.
Step 3
Scan QR Codes
Read this article on your phone.
- HTML
- CAJ Download
- PDF Download
Download the mobile appuse the app to scan this coderead the article.
Tips: Please download CAJViewer to view CAJ format full text.
Download: 180 Page: 4547-4551 Pagecount: 5 Size: 265K
Citation Network
Related Literature
- Similar Article
- Reader Recommendation
- Associated Author