| Aiming at the low forage yield in Inner Mongolia,and the large area and low utilization rate of saline-alkali land,this paper tested the acres of saline-alkali land in Wuyuan County,Bayannaoer City,Inner Mongolia.After the 2018-2019 wheat harvest,we conducted a multi-feeding rapeseed(Forage oil No.2,R)sorghum(Neinong No.1,S)experimental study after the 2018-2019 wheat harvesting.There kinds of mixed sowing ratios were set up,including R:S=7:3,R:S=3:7,R:S=5:5,R,S 2 single crop treatments,as well as 3 levels of chemical fertilizer,organic fertilizer,and non-fertilization.By measuring forage yield,quality,and soil characteristics,the effects of fertilization and different mixed sowing ratios on forage yield and quality were explored.Screening forage mixed mode suitable for Hetao Plain.The results show:1.For the two-year mixed cropping RS3:7 model,the highest yield of fresh grasses was 55250 kg/hm2 and 49625 kg/hm2 under chemical fertilizer treatment,respectively.Under the same fertilization treatment,the maximum LER value of fresh grass in the mixed RS3:7 model for two years reached 1.17 and 1.51 respectively.The yield of hay is best under the mixed RS5:5 mode with chemical fertilizer treatment,which is 44.92%and 95.90%higher than that of single crop rape.The land equivalent value of RS5:5 is higher than that of other mixed crop treatments,and the LER values of hay for the two years are 1.62 and 1.96,respectively.2.The content of crude protein and crude fat in two years was the highest under the mixed fertilizer application of RS3:7.Under the same fertilization treatment,the crude protein content of RS3:7 fertilizer treatment increased by 9.57%-19.77%and 6.40%-20.91%compared with RS7:3 and RS5:5 in two years;crude fat content increased by 6.15%-7.81%,10.14%-22.67%.In RFV 2018,the application of organic fertilizer treatment in RS3:7 mode was higher than that of chemical fertilizer application and non-fertilization treatment.In 2019,the highest rate of mixed fertilizer application in RS3:7 mode was 196.96.3.The two-year mixed cropping RS3:7 mode can effectively reduce the soil salinity under the application of organic fertilizers,and this mode is most effective in the treatment of soil alkaline decline.In the mixed cropping RS3:7 mode,the application of chemical fertilizers has the highest organic matter content,which has increased by 5.88%-20.00%and 1.43%-15.96%compared with the other two types of mixed sowing in two years.The RS3:7 soil alkali-hydrolyzed nitrogen content increased by 16.39%and 7.58%,7.58%and 2.90%respectively under the two-year application of chemical fertilizer treatment compared with single-cropped rape and single-cropped sorghum.The contents of available phosphorus and available potassium in soil were also the highest under the mixed fertilizer RS3:7 mode under the application of chemical fertilizers.4.The effect of mixed RS3:7 mode fertilizer application on soil enzyme activity was the best.Under the same fertilization treatment,the soil catalase activity of the RS3:7 mixed fertilizer treatment in 2018 and 2019 increased by 4.41%-5.49%,0.71%-1.71%respectively compared with the other two mixed sowing rates;soil invertase activity Increased by 5.33%-12.15%,9.29%-30.63%;soil urease activity increased by 15.58%-29.94%,11.11%-17.65%;soil alkaline phosphatase activity increased by 8.07%-13.41%,11.76%-28.09%.In short,RS3:7 combined with chemical fertilizer application is the best cultivation measure,and its fresh grass output can reach 49625-55250 kg/hm2.This study can provide technical support for the development of post-wheat multiple cropping in Hetao area,and has theoretical guiding significance for the sustainable development of agriculture and animal husbandry. |
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