Study On The Effect Of Intercropping Of B.napobrassica/Potato

This test was set under the condition of field experiment, B.napobrassica and potato were chosen as the objection to have intercropping model test. There were four treatments, which were respectively treatment Ⅰ（B.napobrassica monoculture）, treatment Ⅱ（potato monoculture）, treatment Ⅲ（B.napobrassica intercropping potato, interval） and treatment Ⅳ（B.napobrassica intercropping potato, without interval）. This test researched on the influential to growth period, soil temperature, photosynthetically active radiation, leaf area index, moisture and yield of crop under four kinds of different planting conditions by completely random design, and the optional combination scheme in practical production can be selected. The results showed that:1) The monoculture of B.napobrassica and potatoes and intercropping of B.napobrassica effected on their growth period were not significant. The growth period of potatoes and B.napobrassica were respectively 178 d and 219 d.2) With the condition of monoculture and intercropping of B.napobrassica and potatoes, there was no change in diurnal variation and seasonal variation characteristic of soil temperature. The amplitude of diurnal variation of soil temperature was B.napobrassica and potatoes intercropping > B.napobrassica monoculture > potatoes monoculture. The daily amplitude of surface soil temperature was maximum, and with the increasing of soil depth, the daily amplitude decreased. There was no difference of soil temperature among five soil depth at 7:30, 13:30 and 18:00 during the growth period.3) The photosynthetically active radiation of monoculture and intercropping presented the variation of single-peak curve, and the photosynthetically active radiation in the morning and afternoon were basically symmetry. The photosynthetically active radiation and leaf area index had good correlation, there presented a positive correlation between yield monoculture and intercropping and photosynthetically active radiation and leaf area index. Under the condition of not reaching the saturation of leaf area index and photosynthetically active radiation, the bigger leaf area index were, the higher productions of crop system were.4) The soil moisture of monoculture and intercropping had obvious characteristic in the whole growth season, the variation of soil moisture content was similar, with the soil depth increased, the soil moisture decreased, and the soil moisture of intercropping was higher than monoculture.5) Two kinds of intercropping methods of land equivalent ratio of 1.59 and 1.69 respectively in this test, it showed that B.napobrassica / potatoes intercropping had a certain advantage in yield. The yield performance: treatment Ⅳ> treatment Ⅲ> treatment Ⅱ> treatment Ⅰ; The ratio of output to input: treatment Ⅳ> treatment Ⅲ> treatment Ⅱ> treatment Ⅰ; Economic benefits: treatment Ⅳ> treatment Ⅲ> treatment Ⅱ> treatment Ⅰ. The yield(77247.06 kg·hm^-2), the ratio of output to input（10.05） and economic benefits(46655.2 CNY·hm^-2) of treatment Ⅳ showed the most advantage, which was the best cultivated mode can be selected in this test.