首页   按字顺浏览 期刊浏览 卷期浏览 Dryland corn response to tillage and nitrogen fertilization. I. Growth‐yield...
Dryland corn response to tillage and nitrogen fertilization. I. Growth‐yield‐N relationships

 

作者: G. K. Evanylo,  

 

期刊: Communications in Soil Science and Plant Analysis  (Taylor Available online 1990)
卷期: Volume 21, issue 1-2  

页码: 137-151

 

ISSN:0010-3624

 

年代: 1990

 

DOI:10.1080/00103629009368220

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

Crop response to fertilizer nitrogen (N) is dependent upon tillage management. This study was conducted to determine how tillage rotation influences non‐irrigated crop growth, N uptake and yield. The effects of tillage rotation, N rate and N timing schedule on early season dry matter production and N uptake, ear leaf N concentration at silking, and yield of corn [Zea mays(L.) Pioneer 3378] were investigated at Painter, VA, on an Altavista loam (fine‐loamy, mixed, thermic Aquic Hapludult). In 1986, maximum yields achieved in the 6‐year continuous no till (NT) [5.82 Mg/ha] and first year no till (AT) [5.64 Mg/ha] were significantly greater than that of the 6‐year continuous conventional till (CT) [3.67 Mg/ha], but no yield differences were obtained in the drier 1987 season. A higher rate of N fertilizer was required to obtain maximum yield in the first year no till (168 kg N/ha) than in the NT (112 kg N/ha) during 1986. Early 1986 N uptake and growth response with and without N at planting increased in the order CT < AT = NT and AT < CT < NT, respectively, indicating greatest immobilization of soil N occurred in the newly established no till soil. Lack of differences in critical ear leaf N values developed for NT and CT in each year imply that plant norms developed for one tillage system may accurately assess N status of corn grown under different tillage practices.

 

点击下载:  PDF (459KB)



返 回