Plant patterns of interplanting potato(Solanum tuberosum L.) and rapeseed(Brassica campestris L.) were optimized by testing the yield of potato and rapeseed.Results showed that under the conditions of normal sowing of rapeseed(Sowing seed on the 10th of Sept,and transplanting seedlings on the 10th of Oct,or direct seeding on the 25th of Sept),interplanting of rapeseed and potato had no obvious effect on the yield of potato and rapeseed(compared to CK in which rapeseed was plant alone).Under the same planting pattern with the same sowing time,the yield of rapeseed with different planting density differed significantly.The yield of interplanting pattern in which seeds were sown on the 10th of Sept,and transplanting on the 10th of Oct,or interplanting on the 25th of Sept was the highest.Transplanting rapeseed or direct seeding rapeseed at suitable sowing time could both obtain high yield with suitable planting density.Considering yield and economic efficiency,interplanting of direct-seeding rapeseed on the 25th of Sept at the density of 225 000 ind./ hm2 could balance the yield of potato and rapeseed and economic efficiency level.

The rapeseed undersowing rice cultivation model is effective for double cropping rice in winter fallow field in southern area of China.The symbiosis time of rice and rapeseed as well as seeding amount are key factors to affect the yield of rapeseed undersowing rice.To explore the growth and yield affected by different symbiosis times and various seeding amounts, we designed a split-plot experiment with two factors.The results showed that: (1) the rapeseed density decreased with the delay of growth period, and the rapeseed undersowing rice was favorable for improving the density at the seedling stage, but the density at the other growth stages decreased with extension of symbiosis; (2) symbiosis time and seeding amount had a significant effect on rapeseed density at each growth period, moreover, there was significant positive interaction effect at emergence stage, the density at maturity period in two experiment at locations reached the maximum when symbiosis time was 10 days and the seeding at 9.0 kg ha -1 ; (3) the symbiosis time and seeding amount influenced the growth and development at each period, leaf area index increased when symbiosis time delayed, which led to weak and thin seedlings, therefore, resulting in the changes of yield component, yield per plant as well as plot yield.In conclusion, the rapeseed undersowing rice cultivation model can significantly increase the rapeseed yield, and suggest a favorable condition of 10 days symbiosis and seeding at 9.0 kg ha -1 for getting higher yield.

Based on the experience of agricultural technology extension for several years,author summarized the technique essentials of direct seeding rapeseed cultivation in no-tillage paddy rice field,such as the arrangement of previous crops, the selection of variety,suitable sowing date,chemical weeding,the application of fertilizer,the management of field,pest control and timely harvesting.

Six new cultivation models are tested in Hubei Province under uniform experiment design and with random sampling methodology. The models are transplanting in plowed paddy-field (TPP), direct seeding in plowed paddy-field (SPP), transplanting in untilled paddy-field (TUP), direct sowing in untilled paddy-field (SUP), relay transplanting in untilled cotton field (TUC), and relay sowing in untilled cotton field (SUC). And yield per unit area (YPA), yield per unit material input (YPM), yield per unit labor (YPL), and cost per kg rapeseed were used to review all these models. Results showed that direct seeding and no-tillage cultivation models characterized by simplicity with lower cost, higher efficiency and profit for saving working days. However, these simplified cultivation models are relatively of lower material utilization rate and lower unit area yield compared with the traditional model of transplanting.

<正>"双低"油菜是指油菜籽中的油含芥酸低,菜籽中的天然毒性物质硫甙含量低的油菜。临床研究结果表明,"双低"菜籽油的脂肪酸组成是植物油中最合适的,

澳大利亚油菜生产历史较短,但国家对油菜生产比较重视,有关发展油菜生产的措施比较得法.因此,在不太长的时期内,油菜生产和加工业取得了长足的发展.