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中国油料作物学报 ›› 2015, Vol. 37 ›› Issue (4): 489-.doi: 10.7505/j.issn.1007-9084.2015.04.009

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Effects of applied nitrogen on dry matter accumulation and oil flax yield in flax/soybean intercropping system

  

  1. 1. College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China; 2. College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China
  • Online:2015-08-28 Published:2015-11-06

Abstract:

 To optimized nitrogen management on oil flax/soybean intercropping system, field experiment was carried out to investigate N effect on dry matter accumulation and yield of 2 crops. 3 different N rates (0, 75 and 150 kg/hm2) were applied on monocropping and intercropping respectively. Results showed that fitted logistic equations of oil flax dry matter accumulation were significant at P<0.01. The maximum rate of dry matter accumulation of monocropping oil flax occurred at flowering stage. It moved to fruiting stage under 150kg/hm2 N on intercropping oil flax. Under monocropping, total dry matter accumulation and grain dry matter accumulation were increased with N application, and reached the highest under 150kg/hm2 treatment (T3). Under intercropping in contrast, 75kg/hm2 N application (T5) led to the top dry matter accumulation. Compared to monocropping, the maximum intercropping oil flax yield (as 3 204.80kg/hm2) was obtained due to higher translocation of dry matter (before anthesis), higher dry matter accumulation (after anthesis), and higher contribution rate of dry matter assimilation to grains. Additionally, mutually beneficial effect was greater than competition effect in oil flax/soybean intercropping system. In conclusion, half N application (75kg/hm2 N) under flax/soybean intercropping obtained high yield of 3 204.80kg/hm2 flax seeds

Key words: Oil flax, Soybean, Intercropping, Nitrogen application, Dry matter accumulation, Yield