Efficient use of fertilizer nitrogen on grass swards: effects of timing, cutting management and secondary grasses

1986 ◽  
pp. 29-37 ◽  
Author(s):  
R. D. Harkess ◽  
J. Frame
Keyword(s):  
Fertilizer Nitrogen ◽  
Cutting Management

Response of grass swards to fertilizer N under cutting or grazing

1979 ◽  
Vol 92 (3) ◽  
pp. 549-562 ◽  
Author(s):  
M. V. Jackson ◽  
T. E. Williams
Keyword(s):  
Dry Matter ◽  
Management Systems ◽  
Significant Response ◽  
Yield Response ◽  
First Year ◽  
Fertilizer N ◽  
Fertilizer Nitrogen ◽  
Cutting Management ◽  
Cutting Experiments ◽  
Applied Nitrogen

SUMMARYAn experiment was conducted at six widely separated centres in England and Wales for 4 years to compare the response of a perennial ryegrass (cv. S. 23) sward to fertilizer N at input rates of 200, 400 and 600 kg N/ha under cutting-only or grazing-only management systems. Under both managements the yield response to N varied substantially and was always greater under cutting than grazing and the response was greater in the first than in subsequent years. Under cutting, significant responses were obtained from 200 to 400 kg N/ha at all sites and in all years but very few sites responded significantly from 400 to 600 kg N/ha after the first year. Under grazing there was on average of all sites (but not at every site) a significant response from 200 to 400 kg N/ha only in the first year. In subsequent years no single site gave a worthwhile response in each year. Under grazing no site showed a significant response from 400 to 600 kg N/ha.At the lowest application of nitrogen, 200 kg N/ha, dry-matter yields under grazing were greater than those under cutting on eight of the possible 24 centre-year occasions. At the two higher rates of applied nitrogen dry-matter yields under cutting were consistently greater than those under grazing.With smaller responses to applied nitrogen on grazed than on cut swards maximum yields were achieved under grazing with an input of about 200 kg N/ha less than under cutting management. The results suggest that cutting experiments cannot be used to predict herbage yields and responses to fertilizer nitrogen under grazing conditions.

Migration and transformation of fertilizer nitrogen in a simulated black soil column

2010 ◽  
Vol 18 (4) ◽  
pp. 683-688 ◽  
Author(s):  
Chao ZHANG ◽  
Yu-Ping CHE ◽  
Zhong-Pei LI
Keyword(s):  
Soil Column ◽  
Black Soil ◽  
Fertilizer Nitrogen

Crop residues and fertilizer nitrogen influence residue decomposition and nitrous oxide emission from a Vertisol

2010 ◽  
Vol 47 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Wisal Muhammad ◽  
Sarah M. Vaughan ◽  
Ram C. Dalal ◽  
Neal W. Menzies
Keyword(s):  
Nitrous Oxide ◽  
Crop Residues ◽  
Nitrous Oxide Emission ◽  
Fertilizer Nitrogen ◽  
Residue Decomposition

Effects of N and K Fertilizers on Cynodon IB.8 and on Soil K in Southern Nigeria

1973 ◽  
Vol 9 (3) ◽  
pp. 249-255
Author(s):  
H. R. Chheda ◽  
M. A. Mohamed Saleem
Keyword(s):  
Negative Correlation ◽  
Grazing Management ◽  
Initial Soil ◽  
Southern Nigeria ◽  
Ca Uptake ◽  
Cutting Management ◽  
Soil K Status

SUMMARYCynodon IB.8 was subjected to (i) various levels of N under cutting management, and (ii) various levels of K under grazing management. The results indicated significantly higher DM and CP production with 168 kg./ha. of N under cutting management, with resultant significant reduction in exchangeable and non-exchangeable soil K. Under grazing management, increased K application increased K content in the herbage, but showed a negative correlation with Ca uptake. Results indicated that the initial soil K status was adequate to supply the requirements of Cynodon, and that under grazing management the soil K status could be maintained at adequate levels to support lengthy cropping.

Sign in / Sign up

Export Citation Format

Share Document