摘要
试验主要研究在西北干旱地区膜下滴灌条件下,不同水势处理对干制辣椒产量和水分利用效率的影响,从而确定适合该地区的辣椒滴灌控水下限。试验根据滴头下25cm深处土壤的基质势设置5个控水下限:-10kPa、-20kPa、-30kPa、-40kPa和-50kPa,测量的指标主要有叶面积、株高、土壤水分和产量等。试验结果表明,以-30kPa为灌水下限的处理具有较高的叶面积指数、株高、最高的辣椒产量和水分利用效率。而控水下限过高和过低均会影响产量。因此在西北干旱地区膜下滴灌条件下,建议干制辣椒的控水下限为-30kPa。
A field experiment was carried out to compare the effects of different soil water potential on yield and water use efficiency of pepper under mulched drip irrigation condition to determine optimal water potential for pepper growth in the arid areas in Northwest China. Five treatments were evaluated based the soil potentials at 25 cm under the ground, they are -10 kPa,-20 kPa,- 30 kPa,- 40 kPa and -50 kPa. Pepper leaf area, plant height, soil water content and yield were measured. Results showed that pepper yield and water use efficiency are highest, and leaf area index and plant height are similar for the treatment with a potential threshold of -30 kPa as compared to other treatments. Higher or lower potential thresholds will limit plant yield and water use efficiency. Therefore, we recommend -30 kPa as the irrigation threshold for pepper cultivation under mulched drip irrigation in arid areas in the Northwest China.
出处
《南水北调与水利科技》
CAS
CSCD
2010年第1期88-91,共4页
South-to-North Water Transfers and Water Science & Technology
基金
水利部行业公益基金项目(200801104)
黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10501-260)
关键词
干制辣椒
水势
产量
水分利用效率
膜下滴灌
pepper
soil water potential
yield
water use efficiency
mulched drip irrigation
