为了充分发挥红壤旱地的生态功能,筛选出较优化的玉米种植系统,本研究依据近23 a (1984～2006)的田间试验资料,从农田生态系统的生产功能、能流功能、价值流功能以及用养结合功能等四个方面对红壤旱地15种玉米种植系统进行了分析,并采...为了充分发挥红壤旱地的生态功能,筛选出较优化的玉米种植系统,本研究依据近23 a (1984～2006)的田间试验资料,从农田生态系统的生产功能、能流功能、价值流功能以及用养结合功能等四个方面对红壤旱地15种玉米种植系统进行了分析,并采用灰色关联度法从生态效益、经济效益和社会效益三个层次13个指标对各种植模式进行综合评价,筛选出了3种适宜于在红壤旱地上推广的较优化的玉米种植系统。结果表明,处理(10)"豌豆/早玉米+旱稻/晚玉米"的社会效益和生态效益关联度值分别为0.750和0.986,均居第一位,其经济效益关联度值为0.841,居第二位,经灰色关联度分析,得出其综合加权关联度值最大,是最适宜在南方红壤旱地上推广的优化种植模式。处理(12)"紫云英—早玉米—芝麻"和处理(11)"豌豆/棉花+早玉米"的加权关联度值也较大,分别为0.739和0.716,居第二位和第三位,这两种种植模式对今后红壤旱作区种植业结构布局和种植方式的优化具有积极意义。展开更多
Maize-rice cropping systems are expanding in Bangladesh. Hybrid maize has increasing demand and value, particularly for poultry feed, while rice remains the traditional dominant starch staple food. Bangladesh maize yi...Maize-rice cropping systems are expanding in Bangladesh. Hybrid maize has increasing demand and value, particularly for poultry feed, while rice remains the traditional dominant starch staple food. Bangladesh maize yields （with average farm yields around 5.7 t·ha^-1） are among the highest found in Asia. Cool winter （Rabi） season maize followed by T. Aman （monsoon） rice is the major cropping system; however it is now becoming diversified with many other crops including potato. Financially, hybrid maize is far more profitable than boro （irrigated） rice, wheat, or most other competing winter season Rabi crops. Although maize is relatively problem-free in Bangladesh, some constraints are intensifying with increased concern over input supply and soil-related environmental sustainability. An array of new technologies for sustainable intensive maize production systems is emerging in Bangladesh and some are being promoted and adopted. Continued sustainability of hybrid maize production in Bangladesh depends on optimization of planting time, quality seed of appropriate hybrids, balanced use of nutrient inputs along with soil fertility conservation and other management, for which further research would be high priority.展开更多
文摘为了充分发挥红壤旱地的生态功能,筛选出较优化的玉米种植系统,本研究依据近23 a (1984～2006)的田间试验资料,从农田生态系统的生产功能、能流功能、价值流功能以及用养结合功能等四个方面对红壤旱地15种玉米种植系统进行了分析,并采用灰色关联度法从生态效益、经济效益和社会效益三个层次13个指标对各种植模式进行综合评价,筛选出了3种适宜于在红壤旱地上推广的较优化的玉米种植系统。结果表明,处理(10)"豌豆/早玉米+旱稻/晚玉米"的社会效益和生态效益关联度值分别为0.750和0.986,均居第一位,其经济效益关联度值为0.841,居第二位,经灰色关联度分析,得出其综合加权关联度值最大,是最适宜在南方红壤旱地上推广的优化种植模式。处理(12)"紫云英—早玉米—芝麻"和处理(11)"豌豆/棉花+早玉米"的加权关联度值也较大,分别为0.739和0.716,居第二位和第三位,这两种种植模式对今后红壤旱作区种植业结构布局和种植方式的优化具有积极意义。
文摘Maize-rice cropping systems are expanding in Bangladesh. Hybrid maize has increasing demand and value, particularly for poultry feed, while rice remains the traditional dominant starch staple food. Bangladesh maize yields （with average farm yields around 5.7 t·ha^-1） are among the highest found in Asia. Cool winter （Rabi） season maize followed by T. Aman （monsoon） rice is the major cropping system; however it is now becoming diversified with many other crops including potato. Financially, hybrid maize is far more profitable than boro （irrigated） rice, wheat, or most other competing winter season Rabi crops. Although maize is relatively problem-free in Bangladesh, some constraints are intensifying with increased concern over input supply and soil-related environmental sustainability. An array of new technologies for sustainable intensive maize production systems is emerging in Bangladesh and some are being promoted and adopted. Continued sustainability of hybrid maize production in Bangladesh depends on optimization of planting time, quality seed of appropriate hybrids, balanced use of nutrient inputs along with soil fertility conservation and other management, for which further research would be high priority.
