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A lysimeter study of nutrient losses from urine and dung applications on pasture

, : A lysimeter study of nutrient losses from urine and dung applications on pasture. New Zealand Journal of Experimental Agriculture 9(1): 39-46

The effects of superphosphate plus KCl alone, and with dung or urine, on pasture and soil were compared in a lysimeter experiment investigating the fate of applied K on a yellow-brown pumice soil. The percentages of K applied in KCl, dung and urine recovered in herbage and lost in drainage were 73, 80 and 51 and 2, 3 and 4, respectively. Superphosphate plus KCl plus urine showed highly significant increases of exchangeable K down the soil profile compared with superphosphate plus KCl alone. The dung treatment resulted in only minor changes in exchangeable K in the soil. The concentration of Mg in the herbage was depressed by urine but increased by dung which also increased exchangeable Mg in the soil to a depth of 30 cm. Drainage losses of S from superphosphate, dung and urine were 41, 0 and 67%, respectively, of the amounts of S added. Ca and Mg losses in drainage were approximately equivalent to nitrate and chloride losses, and it was apparent that the presence of mobile anions, especially chloride, play a major part in the leaching of Ca and Mg from yellow-brown pumice soils.


DOI: 10.1080/03015521.1981.10427801

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