By H. G. Van Der Meer (auth.), H. G. Van Der Meer, J. C. Ryden, G. C. Ennik (eds.)
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Additional info for Nitrogen Fluxes in Intensive Grassland Systems
Grasses sown are discussed below but included species and cultivars of Lolium, Holcus, Festuca, Agrostis and Poa. Fertilizer application Spring N trials received 90 kg N ha -1 as ammonium nitrate along with 26kgPha- 1 and 50kgKha- 1 as a 0:19:19 compound fertilizer. At least six application dates were spread out to cover the target temperatures viz, Dutch T sum 200°, T value 100° and T soil 150°. First application dates ranged from 5 February to 12 March at the lowland site and from 6 February to 2 March at the upland site.
Work reported here has examined different cutting regimes which incorporate various levels of N application in order to define fertilizer/cutting systems for specific animal enterprises. Although indigenous or 'secondary' grasses such as Agrostis, Festuca and Holcus species are widespread in British grasslands, there is a lack of data on their yield, quality and response to differing rates of application of fertilizer N [3, 5] . A series of experiments has been started to assess the productivity of these grasses and the results of the first three years are presented.
On-farm consideration must weigh the cost and quality of production against the cost of alternative feeds. In Systems Band C, designed to produce high quality silage (68-72 D value), DM response to N was reduced in 1983 due to dry summer weather. System B (3 cuts) increased silage yield and quality over System A (2 cuts). System C (4 cuts), whilst improving silage quality, was lower yielding than System A at similar N levels. Silage quality target is determined by the needs of the livestock system and the ability to make sufficient silage.
Nitrogen Fluxes in Intensive Grassland Systems by H. G. Van Der Meer (auth.), H. G. Van Der Meer, J. C. Ryden, G. C. Ennik (eds.)