| Paddy rice-upland crop rotation mode has been widely used in China, it has a long history. Reasonable province.with rotation mode can improve the ecological environment of soil, increase soil nutrient accumulation, create favorable conditions for crop growth. For a single province.with rotation mode at the present stage in China, such as oil, rice, wheat and rice research more. But for more than two extremely severe rotation mode had less study on the same condition. This study based on soil phosphorus and potassium, the southwest five kinds of common province.with rotation mode (beans, rice, potatoes, rice, rapeseed, garlic, rice, wheat, rice, rice) under the change of soil nutrient anniversary, and severe two crops on the absorption of soil nutrient use efficiency contrast research, seek different province.with the characteristics of soil nutrient accumulation in rotation mode anniversary and output gap, provide theoretical support for the reasonable arrangement of production and application. The main result of the test were as follows.1. The rotation of garlic and broad bean could significantly improved the yield of rice in the dry season. After the annual test, planting garlic and broad bean in the previous season, the effective ear,1000 grain weight, seed setting rate had a positive effect, the yield was the highest, reaching 9374kg/ha,9531 kg/ha. In the previous season, the yield of wheat and potato in the plot was centered, reaching 8920 kg/ha,8932 kg/ha, respectively. The yield of rape was the lowest, only 8688 kg/ha in the previous season, Therefore, the yield of rice was higher than that of oil rice model under the rice cropping system.2. After annual crop rotation, the surplus of phosphorus content in soil and the deficit of potassium content decreased. The utilization ratio of potassium in the dry season and rice in the two season was more than 30%. The utilization efficiency of phosphorus is low. After the anniversary of the rotation mode, the total phosphorus in the soil had been improved, the available phosphorus content was up and down, and the content of total potassium and available potassium decreased.3. The annual gross output of wheat-rice and garlic-rice rotation mode was significantly higher than that of other crop rotation patterns. The annual gross output of the garlic rice model was 26546.80ka/ha. The total mass production of wheat rice was 33555.34ka/ha. The lowest oil-rice model, the total material output is 20564.2ka/ha.4. Garlic-rice and potato-rice crop rotation mode which produce economic product value was significantly higher than other crop rotation mode. Garlic-rice mode two quarters economic product to a value of 46.91 x 106 kj.Potato-rice model two quarter product could be a value of 42.18 x 106 kj. Products to the lowest value beans was higher than economics about 200% that of rice model.5. Different rotation modes dry season for potassium use efficiency was high, the phosphorus use efficiency was low, the rice season for potassium use efficiency was high, the phosphorus use efficiency was low. Phosphorus utilization of five kinds of crop rotation mode was 4.1% of the dry season, the rice season on phosphorus utilization to an average of 6.68%. Five kinds of crop rotation mode of potassium utilization to an average of 45.42% of the dry season.Rice season of potassium utilization to an average of 42.2%. |
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