Combined Application of NPK Fertilizer Affecting Grass Yield, Soil Fertility and Species Diversity in Leymu schinensis Steppe

doi:10.11924/j.issn.1000-6850.casb16040130

Abstract

Abstract: In order to explore the effect of combined application of NPK fertilizer on grass yield, soil fertilizer and species diversity and provide a theoretical basis for restoration of degraded grassland,“3414”fertilizer application scheme of NPK fertilizer was conducted inLeymus chinensis steppe in the southern edge of Inner Mongolia. The results showed that the above-ground biomass ofLeymus chinensis had the maximum value of 133.63 g/m2 in N2P1K1, which increased by 235.66% compared with that of N0P0K0 (no fertilizer application) significantly (P <0.05). The total above-ground biomass increased significantly in N2P2K2, N2P1K1, N2P0K2 and N2P3K2 compared with that in N0P0K0 (P <0.05). The total above-ground biomass of N2P2K2 and N2P1K1 was up to 210.68 and 206.73 g/m2, and increased by 116.86% and 112.80% compared with that of N0P0K0 respectively. Soil electric conductivity in N2P3K2 was 422.13 μs/cm, which was significantly larger than that of N0P0K0, N1P1K2 and N1P2K1 (P <0.05). Content of total N in N3P2K2 had the highest value of 0.31 g/kg, which was significantly larger than that of N0P0K0 which was 0.23 g/kg (P <0.05). Contents of total K in N2P2K3 and N1P1K2 were 1.58 and 1.57 g/kg respectively, and were significantly larger than that of N0P0K0 which was 1.45 g/kg (P <0.05). Content of available P reached the peak (11.79 mg/kg) in N3P2K2, while content of available K reached the peak (358.83 mg/kg) in N2P3K2. Margalef richness index increased significantly in N0P2K2 compared with that in N2P2K0, N2P2K3 and N3P2K2, while decreased significantly in N3P2K2 compared with that in N0P2K2 and N2P1K1. Generally, it is suggested that the combined application of N2P1K1 (N 56 kg/hm2, P2O5 89 kg/hm2, K2O 34 kg/hm2) is the optimal choice in Leymus chinensis steppe.

CLC Number:

S147.22

仝宗永,权国玲,,,,, and . Combined Application of NPK Fertilizer Affecting Grass Yield, Soil Fertility and Species Diversity in Leymu schinensis Steppe[J]. Chinese Agricultural Science Bulletin, 2016, 32(32): 105-110.

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