Scientia Agricultura Sinica ›› 2018, Vol. 51 ›› Issue (20): 3920-3927.doi: 10.3864/j.issn.0578-1752.2018.20.010

• TECHNIQUE APPLICATION • Previous Articles     Next Articles

Effects of the Controlled Release Fertilizer on Nitrate Accumulation and Migration in the Soil of Wheat-Maize Rotation System

Ning SHI1(), Yan LI1(), YingPeng ZHANG1, JiaFa LUO2, ZiWen ZHONG1, Ming SUN1, ZhaoHui LIU3, YongPing JING1, LuJi BO1   

  1. 1Agricultural Institute of Resources and Environment, Shandong Academy of Agricultural Sciences/Key Laboratory of Agro-Environment of Huang-Huai-Hai Plain, Ministry of Agriculture/Shandong Provincial Key Laboratory of Agricultural Non-Point Source Pollution Control and Prevention, Jinan 250100, China
    2AgResearch, Ruakura Research Centre, Hamilton 3240, New Zealand
    3Shandong Academy of Agricultural Sciences, Jinan 250100, China
  • Received:2018-01-19 Accepted:2018-06-21 Online:2018-10-16 Published:2018-10-16

Abstract:

【Objective】 This study explored the effects of urea coated by resin on the crop yield, nitrogen (N) recovery efficiency, N apparent loss, nitrate accumulation and migration of winter wheat and summer maize, which could provide theoretical support for further development of one-off fertilization technique. 【Method】 Field experiments in winter wheat-summer maize were set up with four different treatments, described as below : (1) No N fertilizer (CK), (2) Optimal fertilization by split application of urea (OPT, 50% of base fertilizer, 50% of turning green fertilizer of wheat and jointing fertilizer of maize, (3) single basal application of resin coated urea (CRF, 80% N rate of OPT). The OPT and CRF in wheat were fertilized with N 180 kg·hm-2 and 144 kg·hm-2, respectively, which in maize were 210 kg·hm-2 and 168 kg·hm-2, respectively. All the experimental fields were fertilized with P2O5 90 kg·hm-2, K2O 60 kg·hm-2 in wheat, and P2O5 60 kg·hm-2, K2O 60 kg·hm-2 in maize, which were supplied by calcium superphosphate and potassium chloride. The 0-100 cm soil samples were collected at 20 cm increments during the period of returning green stage, jointing stage, booting stage and after harvest for the winter wheat; and seeding stage, jointing stage, filling stage and harvest stage for the summer maize. Shoot and grain samples of crops were collected at harvest stage to analyze nutrients. 【Result】 Compared with OPT, the yield of CRF reached 7.87 t·hm-2, the total N absorption of aboveground was 209 kg·hm-2, and the maize yield and N uptake were 7.57 t·hm-2 and 142 kg·hm-2, respectively. It not only ensured the yield and total N uptake in wheat and maize, but also decreased the apparent N loss in soil in the wheat and maize rotation system. The 40-60 cm soil layer was the main location that nitrate accumulation. The application of CRF could effectively reduce the accumulation of nitrate in 0-100 cm soil layer, and slowing down the rate of nitrate migrate to the deep soil. 【Conclusion】 In the winter wheat-summer maize system, CRF with less N input could reduce the nitrate accumulation and migration in the soil without reducing yield and N uptake. Application of CRF could reduce the environmental risk from the apparent N loss in the soil.

Key words: controlled release fertilizer, nitrate-N, accumulation, migration

Table 1

The grain yield and total N uptake for wheat and maize"

处理
Treatment
产量Grain yield (t·hm-2) 总吸氮量Total N uptake (kg·hm-2 )
小麦 Wheat 玉米 Maize 小麦 Wheat 玉米 Maize
CK 4.97±0.14b 5.79±0.20b 113.70±11.54b 89.2±5.95b
CRF 7.58±0.35a 8.31±0.46a 178.75±12.87a 148.79±8.35a
OPT 7.87±0.71a 7.57±0.38a 209.22±19.84a 142.53±6.74a

Table 2

The apparent N recovery efficiency and the apparent N loss in 0-100 cm soil layer of the different treatments for wheat and maize"

处理
Treatment
氮肥表观利用率
REN (%)
0—100 cm氮肥表观损失量
Apparent N loss in 0-100 cm soil (kg·hm-2)
小麦 Wheat CRF 45.17±8.93a 46.94±6.62b
OPT 53.07±11.02a 97.66±19.83a
玉米 Maize CRF 35.47±4.97A -19.35±22.40A
OPT 25.40±3.21A 53.78±13.27B

Fig. 1

The content of NO3--N in the 0-100 cm soil layer at the different growth stages for wheat RS: Regreening stage; JS: Jointing stage; BS: Booting stage; HS: Harvest stage. The same as below"

Fig. 2

The content of NO3--N in the 0-100 cm soil layer at the different growth stages for maize"

Fig. 3

The relative accumulated rates of NO3--N in the soil layers of the different treatments for wheat Different capital letter indicate significant difference among the soil layers for mean value (P<0.05). The same as below"

Fig. 4

The relative accumulated rates of NO3--N in the soil layers of the different treatments for maize"

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