施肥对荒漠化草地产量及营养物质的影响

Effects of Fertilizer Application on the Yield of Forage and Nutrient Content on desert grassland

2014年以内蒙古短花针茅荒漠草地为研究对象,采用正交试验设计,研究了氮肥(N)、磷肥(P)、有机肥(A)配施对该地区产草量和营养物质的影响。结果表明:(1)牧草最高产量的施肥组合为氮肥(15g/m^2)+磷肥(22.5g/m^2)+有机肥(1500g/m^2);(2)牧草的粗蛋白含量以N_3P_2A_3组合最优;牧草粗灰分最优组合为N_4P_2A_2;牧草粗脂肪含量最优组合为N_4P_3A_1;牧草中性洗涤纤维含量最优组合为N_3P_2A_3;牧草酸性洗涤纤维含量和相对饲用价值最优组合均为N_3P_4A_3。本试验所测牧草营养成分含量与不同施肥种类和水平之间直观比较结果无明显规律性,说明该地区植物营养与氮肥、磷肥、有机肥之间的关系极为复杂,有待今后深入探讨。

The effects of applying nitrogen,phosphorus, organic fertilizer on the forage yield and nutrient con- tent by using orthogonal test on Stipa breviflora desert grassland of Inner Mengoulia in 2014. The results showed： （1） The optimum combination of yield was N ： 15 g/m2 , P20s ： 22.5 g/m2 , organic fertilizer ： 1500 g/m2. （2） The optimum combination of crude protein was Na P2 A3 ;the optimum combination of crude ash was N4P2A2;the opti- mum combination of crude fat was N4 P3 A1 ;the optimum combination of NDF was N3P2 A3 ;the optimum combi- nation of ADF and RFV was N3P4 A3. The test shows that the nutrient content of grass have no clear regularity between different fertilizer types and levels, because of the complex relation between plant nutrient and nitrogen, phosphorus, organic fertilizer and Remains to be studied in the future.