Crops ›› 2016, Vol. 32 ›› Issue (6): 120-123.doi: 10.16035/j.issn.1001-7283.2016.06.020

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Study on the Appropriate Seeding Rate of Late Sowing Oilseed Rape as Green Manure

Hu Min1,Lu Jianwei1,Wang Zhen2,You Qiuxiang2   

  1. 1 College of Resources and Environment,Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtse River,Ministry of Agriculture,Wuhan 430070,Hubei,China
    2 Soil and Fertilizer Station of Wuxue,Wuxue 435400,Hubei,China
  • Received:2016-07-29 Revised:2016-10-18 Online:2016-12-15 Published:2018-08-26

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Abstract:

A field trial was conducted to study the effect of seeding rate on biomass, nutrient accumulation of Huayouza 62, to provide evidences for the appropriate seeding rate on late sowing oilseed rape. The trial included 10 seeding rate treatments ranging from 11.25 to 45.00kg/hm 2. The results showed that the seeding rate had great effect on oilseed rape biomass and nutrient accumulation. Oilseed rape fresh weight, dry weight increased with increasing seeding rate ranged from 11.25-33.75kg/hm 2. When the seeding rate was 33.75kg/hm 2, a fresh weight of 24t/hm 2 and a dry weight of 3.7t/hm 2 were obtained. There was no significant difference on fresh and dry weights, however, once seeding rate was more than 33.75kg/hm 2. The trend of C, N, P, K accumulation was consistent with the change of seeding rate and biomass of green manure oilseed rape. When the seeding rate was 33.75kg/hm 2, the accumulation of C, N, P, K were 1 562.0kg/hm 2, 56.7kg/hm 2, 12.2kg/hm 2 and 103.2kg/hm 2, respectively. Equation simulation results showed that the C, N, P, K accumulation amount reached the highest when the seeding rate was 40.6kg/hm 2, 40.5kg/hm 2, 36.7kg/hm 2 and 36.1kg/hm 2, respectively. Comprehensive results showed that the most suitable seeding rate was 35-40kg/hm 2 for late sowing oilseed rape as green manure under this experimental condition.

Key words: Oilseed rape, Green manure, Late sowing, Seeding rate, Biomass, Nutrient accumulation

Table 1

Effect of seeding rate on biomass of oilseed rape"

播种量Seeding rate(kg/hm2) 有效株数Effective plant number(万株/hm2) 鲜重Fresh weight(kg/hm2) 干重Dry weight(kg/hm2)
11.25 31±5.8e 5 010±286f 723±74f
15.00 50±16.9e 7 355±856f 1 084±193f
18.75 109±22.3d 15 365±1 948e 2 394±268e
22.50 136±18.2cd 18 605±3 018d 2 925±565d
26.25 143±11.6bc 20 760±754cd 3 076±205cd
30.00 166±21.2abc 22 695±1 568bc 3 533±274bc
33.75 174±17.9ab 24 235±2 290ab 3 682±195ab
37.50 181±18.1a 25 035±192ab 3 788±57ab
41.25 197±28.2a 26 565±1 352a 4 166±329a
45.00 188±15.3a 27 035±983a 3 892±370ab

Table 2

Effect of seeding rate on nutrient content of oilseed rape"

播种量Seeding rate(kg/hm2) 碳含量Carbon content(%) 氮含量Nitrogen content(%) 磷含量Phosphorus content(%) 钾含量Potassium content(%)
11.25 41.9±0.10a 1.58±0.14a 0.32±0.02abc 3.30±0.25ab
15.00 41.5±1.04a 1.60±0.16a 0.32±0.01abc 3.26±0.34abc
18.75 42.0±0.85a 1.64±0.08a 0.33±0.01a 3.37±0.14a
22.50 42.5±0.60a 1.59±0.09a 0.32±0.03abc 3.35±0.14ab
26.25 42.1±0.90a 1.63±0.08a 0.32±0.03abc 3.25±0.28abc
30.00 42.0±0.31a 1.57±0.04a 0.32±0.04abc 2.98±0.18bcd
33.75 42.4±0.75a 1.54±0.06a 0.33±0.02a 2.80±0.20d
37.50 42.3±0.67a 1.65±0.13a 0.29±0.03bc 2.91±0.23cd
41.25 41.9±1.27a 1.59±0.05a 0.30±0.02abc 2.70±0.16d
45.00 42.1±0.64a 1.58±0.07a 0.28±0.02c 2.69±0.28d

Fig.1

Effect of seeding rate on the nutrient accumulation of oilseed rape Note: ** indicate extremely significant correlation at 0.01 level, different letters indicate significant difference at 0.05 level"

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