Effects of sheep manure on productivity and nutrition of soil for Poa pratensis cv.Qinghai pasture

The effects of fertilizers, undecomposed sheep manure, decomposed sheep manure on height, coverage, density and above-ground biomass were studied using fertilizing trial plots for Poa pratensis cv. Qinghai in the Three River Origin Region Dawu Area. The height, coverage, density and above-ground biomass after using decomposed sheep manure of 15 000 kg·ha-1 for pasture of P.pratensis cv. Qinghai was 69.5 cm, 80.7%, 6 190 branch·m-2 and 439.4 kg·ha-1, respectively. These indices were equal to 150 kg·ha-1 phosham fertilization application. The decomposed sheep manure had better yield-increasing effect than un-decomposed sheep manure with the same application amount. Organic matter, total nitrogen, available nitrogen, total phosphorus and available phosphorus of soil increase with increasing of the dosage of decomposed sheep manure.