A Study of the Influence of Nitrogen on the Root Weight and Nodulation of White Clover in a Mixed Sward

Young, Dorothy J. B.

doi:10.1111/j.1365-2494.1958.tb00119.x

Cited by 23 publications

(13 citation statements)

References 24 publications

(18 reference statements)

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“…However, results from this present trial and others (1,5,11) indicate that the quantity of clover root material available for decomposition in the soil may be critical in determining the degree of nitrogen transference. The source of nitrogen for transference is governed to a large extent by the rate of breakdown of the legume roots.…”

Section: Resultscontrasting

confidence: 67%

Clover Nitrogen and Sward Productivity

Herriott¹,

Wells²

1960

Grass and Forage Science

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Under mowing conditions in the absence ofthe animal, ultra-simple swards based either on ryegrass or cocksfoot gave large increases in yield of dry matter and nitrogen from the inclusion of white clover in the seeds mixture. Raising the clover seed rate from 1 to 3 Ib./acre gave a further response in yield.As the swards aged, the continuing effect of increased clover seed rate was dependent on applied nitrogen.The rate of transference of nitrogen from clover to the soil depended upon the species of the associated grass, the clover seed rate, the age of the sward and the degree of reduction of the clover in the sward.Suppression of clover led to an increase in soil nitrogen, particularly with high seed rates of clover. Dry matter response to applied nitrogen (69 lb./acre/annum) was greater in cocksfoot than in ryegrass. Fertilizer nitrogen had little effect on the yield of nitrogen from the sward except where the high seed rate of clover had been used.

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Section: Resultscontrasting

confidence: 67%

Clover Nitrogen and Sward Productivity

Herriott¹,

Wells²

1960

Grass and Forage Science

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“…The latter point was also noted by Young (10). It is important to obtain more information about the rates of growth and decay of clover under sward conditions if the plant is to be fully exploited.…”

Section: Resultsmentioning

confidence: 91%

The Effect of Nitrogenous Fertilizer on an Established White Clover Sward

Cowling

1961

Grass and Forage Science

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The effect of nitrogenous fertilizer on a white clover sward was studied to obtain information to be used in the evaluation of white clover in grassland. There was no evidence of a yield response. The weight of nodules was depressed by the addition of fertilizer.Where management is adjusted to maintain white clover in swards receiving large quantities of nitrogenous fertilizer the clover may use part of this fertilizer at the expense of symbiotic fixation.The relation of the results obtained to the assessment of the benefit derived from white clover in mixed swards is briefly discussed.

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“…However, unless clover comprises a large proportion of the sward, its effects are likely to be small because, although the N concentration in the root organic matter is high at about 3.4-3.8% (Garwood et al, 1972;Whitehead, 1970), the weight of roots is low. Clover root material, separated carefully from 4-year-old mixed swards by Young (1958), was found to amount only to between 40 and 480 kg organic matter ha-l: even when clover comprised 50% of the ground clover, its roots amounted to only 6% of the total root weight. In addition, however, the stolon component of white clover may amount to 400-1000kg dry weight ha -1 (Woledge et al, 1990), with a concentration of N of about 2.9% (Cowling, 1961), and this will result in some increase in mineralizable N from the stubble fraction, compared with an all-grass sward.…”

Section: Discussionmentioning

confidence: 99%

Organic matter and nitrogen in the unharvested fractions of grass swards in relation to the potential for nitrate leaching after ploughing

Whitehead¹,

Bristow²,

Lockyer³

1990

Plant Soil

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The amounts of organic matter in the stubble, litter, root and soil macro-organic matter fractions of two swards of perennial ryegrass that had received normal applications of either fertilizer or cattle urine were, on average for the four fractions, about 3000, 500, 11,500 and 8,800 kg ha -1. The swards had been established 8 or 15 years previously and each was sampled at intervals over a period of about one year. The amounts of N contained in the four fractions were, on average, 68, 12, 249 and 240 kg ha -1, a total of 569 kg N ha-~.With other swards, increasing rates of application of fertilizer N were found to have little effect on the amounts of organic matter in stubble and roots. Concentrations of N in the organic matter of the stubble and roots, however, increased significantly with increasing rate of fertilizer application, though, with stubble, moderate rates of application had little effect.Assessments based on these data, together with other published information, indicate that the amount of N mineralized from the combined stubble, litter, root and macro-organic matter fractions during the first year after ploughing may range from about 40 kg to at least 360 kg N ha -~ depending on the age of the sward and its recent management. The amount mineralized is likely to increase with age of sward, with increasing rate of fertilizer N and with utilisation by grazing rather than cutting.

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A Study of the Influence of Nitrogen on the Root Weight and Nodulation of White Clover in a Mixed Sward

Cited by 23 publications

References 24 publications

Clover Nitrogen and Sward Productivity

Clover Nitrogen and Sward Productivity

The Effect of Nitrogenous Fertilizer on an Established White Clover Sward

Organic matter and nitrogen in the unharvested fractions of grass swards in relation to the potential for nitrate leaching after ploughing

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