Effects of nitrogen fertilizer application and mixing ratio on grass forage yield of oat-pea forage crops and interspecific relationship
To determine the optimal nitrogen fertilizer dosage and mixing ratio for oat-pea mixed grassland in the suitable habitat of Horqin sandy land,a field trial was conducted using a two-factor randomized block design.Four nitrogen fertilizer(pure N)application levels were tested:0(N0),70(N70),140(N140),and 210(N210)kg·hm2,along with six oat-to-forage pea mixing ratios:100∶0(W0),80∶20(W20),70∶30(W30),60∶40(W40),50∶50(W50),and 0∶100(W100).The effects of nitrogen fertilizer rates,mixing ratios,and their interactions on yield and interspecific relationship in the oat-pea mixed grassland were analyzed.The results showed that:with the increase of nitrogen fertilizer,the total yield of oats,forage peas and wheat beans gradually increased.The hay and fresh grass yield of N210 treatment was significantly higher than that of N0 and other nitrogen fertilizer treatments(P＜0.05),and the total yield of wheat beans was increased by 24.33％～48.24％for fresh grass,and 56.91％～111.16％for hay yield,in the N210 treatment compared with the other treat-ments.With the increase of forage pea mixing ratio,the fresh grass yield of oats showed a decreasing trend,the fresh grass and hay yields of forage peas showed an increasing trend,and the total yield of oat-pea showed a trend of increasing and then decreasing,of which the W40 mixing ratio treatment had the highest yield of oat-pea forage crop,which was 29.79 t·hm-2 and 9.06 t·hm-2.The interaction of nitrogen fertilizer and mix ratio showed that the fresh and hay yields of oat-pea mixed grassland were highest under the N210W40 treatment,with yields of 34.4 t·hm-2(fresh grass)and 10.53 t·hm-2(hay grass),respectively.These values were 1.42％to 89.32％and 0.38％to 255.74％higher than those of other treatments.The land equivalent ratio under different mix ratios was＞1,with the highest land equivalent ratio of 1.19 under the W40 treatment.Relative yields of oats＞relative yields of forage peas in the mixed-grassland,oats'aggression intensity＞0.Therefore,it is recommended to use 60∶40 oat-pea mix ratio and 210 kg·hm-2 N fertilizer dosage for oat-pea mix grassland production in Horqin sandy land.
万方数据
维普
