农业工程学报Issue(5)：112-119,8.DOI:10.11975/j.issn.1002-6819.2016.05.016
适宜施氮量提高温室砂田滴灌甜瓜产量品质及水氮利用率
Optimal drip fertigation amount improving muskmelon yield, quality and use efficiency of water and nitrogen in plastic greenhouse of gravel-mulched field
摘要
Abstract
In order to solve water and fertilizer problem in the actual production of muskmelon in plastic greenhouse of gravel-mulched field, the effects of the different management mode of water and fertilizer on plant growth, yield, quality and use efficiency of water and nitrogen of muskmelon in plastic greenhouse under gravel-mulched field were studied in 2013 , the study was to set up a new model of water-saving, good quality and high yield evaluation for muskmelon cultivation in the arid regions of northwest china. The experiment site was Gaolan Experiment Station in Lanzhou city, Gansu province, China. Six treatments were designed including two control treatments and four drip fertigation treatments, control treatments including two nitrogen levels (CK0 and CK, N 0 and 180 kg/hm2) under the traditional flood irrigation, and drip fertigation treatments including 4 nitrogen levels (T1, N 0 kg/hm2; T2, N 180 kg/hm2; T3, N 108 kg/hm2; T4, N 252 kg/hm2 ). Each block was 3 m×4.8 m with 30 plants; blocks were separated by 70 cm deep plastic film to prevent the cross penetration of water and fertilizer. The photosynthesis rate was measured with portable photosynthesis systems between 8:00 am -18:00 pm on fruit enlarging period. The dry matter accumulation and N accumulation amount at different growth stages, yield, quality, use efficiency of water and nitrogen of muskmelon were measured. The results showed that drip fertigation treatments could improved the photosynthesis of muskmelon, and the photosynthesis rate of T2 treatment increased by 21.26% and 13.90% respectively compared to CK at 12:00 and 14:00, and average water use efficiency of drip fertigation treatments increased by 2.55%-12.44% compared to CK. Dry matter accumulation of muskmelon plant had no significant difference between flood irrigation and drip irrigation under the same nitrogen levels between seedling stage to flowering stage, dry matter accumulation of T2 treatment increased by 22.89% and 28.10% significantly (P<0.05) compared to CK respectively at expanding stage and maturing stage. Compared to CK, the drip fertigation treatments increased the yield by 7.40%-14.35%, soluble solid content by 5.00%-9.38%, vitamin C content by 11.52%-16.13%, and the use efficiency of water and nitrogen by 28.81%-40.65% and 22.78%-77.22%, respectively, but reduced nitrate content by 15.55%-27.93%. Besides, drip irrigation could reduce mass fraction of soil in the sand layer, so the service life of gravel-mulched field was extended. Between different nitrogen levels under drip irrigation, dry matter and nitrogen accumulation of plant increased with increasing nitrogen fertilization level. The yield of T2 and T3 treatments were 38189.34 and 36585.15 kg/hm2 respectively, and soluble solid content were 17.5% and 17.1%, respectively, which were the highest among all the treatments. Excessive nitrogen fertilizer could reduce vitamin C content and increase nitrate content of fruit. Nitrogen use efficiency of T3 treatment was 37.73%, which was the highest among all the treatments, and increased by 44.34% and 42.81% compared to T2 and T4 treatments respectively. Water use efficiency of T2and T3 treatment were 30.07 and 29.67 kg/m3, respectively, which was the highest among all the treatments, and increased by 20.76% and 19.16% compared to T1 treatment, respectively. The yield, quality and water and nitrogen use efficiency were the highest for T2 and T3 treatments. So, drip fertigation was efficient management mode of water and fertilizer for muskmelon cultivation in plastic greenhouse of gravel-mulched field in the arid area of northwest china, and the optimal nitrogen rate was 108-180 kg/hm2.关键词
氮肥/灌溉/温室/砂田/甜瓜/产量/品质/水氮利用率Key words
nitrogen fertilizers/irrigation/greenhouses/gravel-mulched field/muskmelon/yield/quality/use efficiency of water and nitrogen分类
农业科技引用本文复制引用
杜少平,马忠明,薛亮..适宜施氮量提高温室砂田滴灌甜瓜产量品质及水氮利用率[J].农业工程学报,2016,(5):112-119,8.基金项目
国家西甜瓜产业技术体系土壤肥料岗位项目（CARS-26-20）；农业部西北地区蔬菜科学观测实验站项目 （）
