التفاصيل البيبلوغرافية
العنوان: |
Effects of applying dairy wintering barn manure of differing C:N ratios directly to pasture on N mineralisation and forage growth. |
المؤلفون: |
Chrystal, JM, Smith, LC, Monaghan, RM, Hedley, M, Horne, D |
المصدر: |
New Zealand Journal of Agricultural Research; Sep2016, Vol. 59 Issue 3, p324-331, 8p |
مصطلحات موضوعية: |
ANIMAL wintering, MANURES, FORAGE, BIOMINERALIZATION, NITROGEN fertilizers |
مستخلص: |
Two experiments were conducted to examine the effect of applying spent dairy wintering barn bedding (termed ‘manure’) to a pasture soil. An incubation study compared rates of nitrogen (N) mineralisation of manures of differing storage durations (fresh, 2.5 months and 12 months) and C:N ratios (26:1, 22:1, 17:1 and 12:1), added to soil at a rate of 289 mg N kg−1soil. The second experiment was a field trial, conducted in South Otago in southern New Zealand which compared pasture dry matter responses to applications of stored manure (c. 70 kg N ha−1; C:N of 18:1) or urea (30 kg N ha−1) to an unfertilised control. Incubation results indicated the addition of urea as a N source to the manure product at a rate to reduce the C:N ratio to approximately 12:1 resulted in a large increase in apparent net mineralisation. Field experiment results showed that application to pasture of manure with a high C:N ratio (above 18:1) resulted in a period of net N immobilisation and pasture growth restriction although there was no difference in annual pasture growth or grass N uptake. Knowledge of the C:N ratio of a manure product may help guide farmers in determining the best time to apply manure to soil to both maximise pasture growth and minimise potential nutrient losses to the environment. [ABSTRACT FROM AUTHOR] |
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قاعدة البيانات: |
Complementary Index |