Interactions Between First and Second Applications of Fertilizer Nitrogen and Implications in Efficiency of Nitrogen Use

Hunt, I. V.; Frame, J.

doi:10.1111/j.1365-2494.1975.tb01372.x

Cited by 6 publications

(7 citation statements)

References 8 publications

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“…Beyond this level nitrogen provides a still smaller increase in the yield. Beyond a level of 300 kg N ha" 1 per season a stand does not produce any further significant increase in the growth of dry matter (Laine 1954, Jäntti and Köylijärvi 1964, Steen 1968, Rinne 1971, Huokuna 1973, Hunt et al 1975, Baerung 1977 a). According to Giöbel and Steen (1965) protein production is linear up to a level of 60 kg N ha" 1 per cutting.…”

Section: Nitrogen and Yielding Ability Of A Forage Standmentioning

confidence: 99%

Growth factors and management technique used in relation to the developmental rhythm and yield formation pattern of a pure grass stand

Pulli

1980

AFSci

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Abstract. The investigation of meadow fescue as a forage crop was carried out at the University of Helsinki in Viikki in 1975 78. The main objective was to study the rhythm of the growth and yield formation pattern of a stand and the relationship between growth pattern and growth factors during different phases of the growing season. The management techniques studied were the number of cuttings, use of nitrogen, requirements of population density and the relationships of management factors to the changes in the quantity and quality of forage yield.The most important growth factors in the seeding year spring and autumn development were the temperature sum and the total radiation available to the plant and nitrogen fertilization beyond the temperature sum range of E 500°C, respectively.During the production years the most important variables in the spring growth were the growing time, the temperature sum and the total radiation. The midsummer and autumn growth were mostly influenced by the total precipitation, amount of nitrogen for the cut and the precipitation during the week before the prior cut.For spring, summer and autumn growth one unit increase in LAI created a DM yield increase of 715, 500 and 315 ha -1 respectively.Increasing the cutting frequency from two to four decreased the total DM yield 2 527 kg ha -1 . The protein content and DM cellulase digestibility increased 4.8 and 13.3 % units respectively. Increasing nitrogen from 130 to 260 kg N ha-1 raised DM and protein yields 1 110 and 485 kg ha-1 , the protein content and DM cellulase digestibility 4.2 and 1.4 % units. The seeding rate requirements for the maximum DM yield were 60 kg ha -1 in the seeding year, 15 -3O kg ha -1 in the second year and 15 kg ha -1 in the third year.The management system involving a seed rate of 30 kg ha-1 , 3 4 cuts and 260 kg N ha-1 is recommended.

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Section: Nitrogen and Yielding Ability Of A Forage Standmentioning

confidence: 99%

Growth factors and management technique used in relation to the developmental rhythm and yield formation pattern of a pure grass stand

Pulli

1980

AFSci

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“…A residual efTectofPN averaging I 5 + 0-5 kg per kg PN was also significant. The PN x SN interaction has already been discussed (Hunt et at.., 1975). The SN X C, PN X C and SN x PN x C interactions were also significant.…”

Section: Resultsmentioning

confidence: 80%

The development of response to fertilizer nitrogen in the first regrowth of perennial ryegrass

Hunt¹,

Frame²,

Harkess³

1981

Grass and Forage Science

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The experiment was undertaken to examine the interactions between yield responses to secondary applications of fertilizer N and length of regrowth interval following .three levels of primary N. A sward of S24 perennial ryegrass received all combinations of three fertilizer treatments, nil, 50, and 100 kg ha"' N for primary growth harvested on 21 May and four treatments, nil, 33, 66 and 100 kg ha"' N for the second growth harvested 2, 3, 4, 5, 6 or 7 weeks later.Cubic equations of growth were derived from the yields of dry matter and both the direct response to secondary N and the residual responses to primary N increased as regrowtbs developed. A positive residual effect to increasing primary N was obtained at the three lower levels of secondary N for weeks 4--7 but a negative response was obtained with the highest level of secondary N. The implications are discussed in terms of target responses and yields and the growth interval required to attain these targets.

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“…Split applications like those reported by Walker et al resulted in increased responses in four of five trials at Massey University (unpublished data), although none of the Massey results was statistically significant. Such responses to a split application of N fertiliser where a fixed total amount of N is applied can be readily understood as the result of a diminishing response curve for increasing rates of N. However, Hunt et al (1975Hunt et al ( ,1981 have conducted experiments specifically designed to measure any interactions between successive applications of N. They used various rates of "primary" and "secondary" N and reported a positive interaction with lower levels of "secondary" N, but a negative interaction at higher levels. They also reported apparent recoveries of fertiliser N > 100% and invoked a "priming effect" to explain their results.…”

Section: Resultsmentioning

confidence: 99%

Improved pasture response to nitrogen applied in winter after application of urea in autumn

Matthew

Chu

Korte³

1986

New Zealand Journal of Experimental Agriculture

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Nitrogen fertiliser was applied as urea in autumn (2 April 1983) and late winter (14 July 1983) to a predominantly ryegrass-white clover pasture on a Manawatu dairy farm. Responses in terms of herbage production, botanical composition, and certain other sward characteristics were measured on 22 August. Residual responses from the autumn application were small and were not statistically significant. Spring responses were significant for herbage mass, tiller weight, sward leaf area index, herbage phosphorus (% P) and total P yield (kg P/ha), herbage dry matter content (% DM), and apparent stubble yield (kg DM/ha). There was a significant, positive interaction between autumn and late winter applications of urea in that herbage mass response to 30 kg N/ha in winter was 7, 12, and 19 kg DM/kg N for plots receiving 0, 30, and 60 kg N/ha in autumn respectively. Possible reasons for this interaction are briefly discussed.

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Interactions Between First and Second Applications of Fertilizer Nitrogen and Implications in Efficiency of Nitrogen Use

Cited by 6 publications

References 8 publications

Growth factors and management technique used in relation to the developmental rhythm and yield formation pattern of a pure grass stand

Growth factors and management technique used in relation to the developmental rhythm and yield formation pattern of a pure grass stand

The development of response to fertilizer nitrogen in the first regrowth of perennial ryegrass

Improved pasture response to nitrogen applied in winter after application of urea in autumn

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