Scientia Agricultura Sinica ›› 2019, Vol. 52 ›› Issue (10): 1733-1745.doi: 10.3864/j.issn.0578-1752.2019.10.007

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Effects of Soil Inorganic Nitrogen and Nitrogen Absorbing by Maize Under the Reduced Application of Coated Urea at Different Proportions

FENG XiaoJie,ZHAN XiuMei(),WANG XueXin,CHEN Kun,PENG Jing,HAN XiaoRi   

  1. College of Land and Environment, Shenyang Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866
  • Received:2018-11-21 Accepted:2019-01-14 Online:2019-05-16 Published:2019-05-23
  • Contact: XiuMei ZHAN E-mail:xiumeizhan@163.com

Abstract:

【Objective】 By studying the effects of nitrogen releasing and nitrogen absorbing by maize under the application of different ratios with coated urea and ordinary urea, this paper aimed to screen the optimal ratio, which was beneficial to the outputs of spring maize in the northeast China and nitrogen utilization efficiency, and to provide the basis for the generalizing of controlled release nitrogen fertilizer on maize.【Method】Field experiments were set in Shenyang and Haicheng of Liaoning province in 2017, and crop strains were Dongdan6531 and Tieyan358, respectively. The experiment fertilizers were ordinary and coated urea. The treatments in both set points included blank control (CK0), ordinary urea nitrogen control (CK) and decreased urea N control treatments (CK1), decreased coated urea N control (T0)compared with (CK)treatments; three different ratios urea between ordinary and coated were arranged in Shenyang (T1, T2 and T3) and two in Haicheng (T1 and T2). The ratios of T1, T2 and T3 were 8:2, 6:4 and 4:6, respectively; the ordinary urea control rate was 244 kg·hm -2 and decreased coated urea N control was 220 kg·hm -2 in Shenyang and that were 217 kg·hm -2 and 195 kg·hm -2 in Haicheng, respectively. Soil and plant samples were collected according to the maize growing season, respectively. Determination of the content of soil inorganic nitrogen and different plant parts nutrient, and the biological yield of different treatments were also measured.【Result】The treatments of coated urea plus the ordinary increased the maize yield significantly (P<0.05), and with the ratio increasing, the yield first rise and then drop. The yield of T2 was the highest (10 250 kg·hm -2), and CK1 was the lowest (9 307 kg·hm -2). The yields of equal N inputting treatments were in the order as T2>T3>T1>T0>CK1, and the grain yield increased 3.89%-25.76% compare to CK1, but there was no significant difference between T2 and CK. The soil inorganic N content was increased at the early maize growth stage applying with either type urea, and the soil N content was rich at the late maize growth stage applying with coated urea. Under the same N input treatments, the N use efficiency (NUE) and agronomic efficiency of N fertilizer (AEN) applied first rise and then drop with the ratio increasing, and T2 was the highest, CK1 was the lowest, the results in different place was the same.【Conclusion】Coated urea plus ordinary urea performed better than other treatments on yield, AEN and NUE, and T2 (i.e. 6:4 of the coated and ordinary urea) was the best. According to the characteristics of coated urea and ordinary urea, we fitted a curve for those results, and made it to know that 62% coated urea plus 38% ordinary urea input could get the best NUE and maize yield in South Central Liaoning, which could increase soil N content at the late of crop growth stage by using coated urea and ordinary urea to their advantages fully, gaining yield and economic benefits.

Key words: resin coated urea (RCU), inorganic nitrogen, NUE, spring maize, yield, decreased-nitrogen

Table 1

Soil properties of the experimental sites"

试验地点
Experimental sites
pH 有机质
Organic Matter(g·kg-1
无机氮
Inorganic N
(mg·kg-1
全氮
Total N
(g·kg-1
解碱氮
Available N
(mg·kg-1
速效磷
Available P
(mg·kg-1
速效钾
Available K
(mg·kg-1
沈阳 Shenyang 5.14 14.61 8.53 0.83 91.40 7.60 89.80
海城 Haicheng 5.14 22.30 18.25 0.86 129.60 27.42 122.76

Fig. 1

Monthly mean temperatures and total precipitation at the experimental site from April to September in 2017"

Fig. 2

Nitrogen release rate and stage release rate of RCU"

Fig. 3

Changes of inorganic nitrogen in 0-20 cm soil layer during a week of fertilizer application"

Fig. 4

Changes of inorganic nitrogen in 0-100 cm soil layer at different growth stages of maize"

Fig. 5

Plant N uptake rate of spring maize during different growth stages"

Table 2

Accumulation rate of spring maize plant N to different growth stage"

吸收特点
Absorption characteristics
处理
Treatment
苗期—拔节期
SD-SS
拔节期—大喇叭口期
SS-BS
大喇叭口期—抽雄期
BS-HS
抽雄期—乳熟期
HS-FS
乳熟期—成熟期
FS-MS
合计
Total
阶段吸收量
N accumulation
(g/plant)
CK0 0.74±0.05a 1.21±0.08ab 0.40±0.17b 0.22±0.10a 0.37±0.11b 2.94b
CK 0.77±0.04a 1.29±0.12a 0.37±0.16a 0.64±0.05b 0.59±0.11ab 3.92a
CK1 0.84±0.03a 1.07±0.11abc 0.61±0.16a 0.52±0.06b 0.87±0.19a 3.90a
T0 0.83±0.03a 1.06±0.06abc 0.44±0.03a 0.91±0.13a 0.67±0.10a 3.90a
T1 0.76±0.04a 0.91±0.10c 0.59±0.05a 1.14±0.26a 0.55±0.21ab 3.95a
T2 0.74±0.02a 0.98±0.05bc 0.58±0.13a 1.03±0.15a 0.80±0.26ab 4.13a
T3 0.77±0.02a 1.07±0.03abc 0.28±0.05a 1.15±0.10a 0.68±0.12a 3.94a
占总量比例
N percentage (%)
CK0 25.1 41.6 13.4 7.5 12.5 100
CK 19.4 32.5 9.5 16.4 14.9 100
CK1 21.8 27.5 15.9 13.3 22.2 100
T0 20.8 26.7 11.1 23.3 17.2 100
T1 18.8 22.6 14.7 28.9 13.9 100
T2 18.4 24.2 14.3 25.0 19.3 100
T3 19.3 26.7 6.9 29.1 17.2 100

Table 3

Effect of different fertilizer treatments on yield and N fertilizer use efficiency of spring maize"

试验地点
Experimental sites
处理
Treatment
产量
Yield
(kg·hm-2
增产率 Increased rate (%) 氮素表观利用率
REN (%)
氮肥农学
效率
NAE (kg·kg-1)
比CK增产
Compared to CK
比CK1增产
Compared to CK1
沈阳 CK0 6855d --- --- --- ---
Shenyang CK 10042ab --- 7.9 31.6e 7.7 abc
CK1 9307c -7.32 --- 31.2f 5.2 d
T0 9669abc -3.72 3.89 32.5d 6.9 bcd
T1 9912ab -1.29 6.5 35.8b 7.7 abc
T2 10250a 2.06 10.12 37.4a 9.5 a
T3 10068ab 0.27 8.19 33.6c 8.7 ab
海城 CK0 7300e --- --- --- ---
Haicheng CK 11850d --- 19.70 29.1e 21.0b
CK1 9900d -16.46 --- 30.3d 13.3d
T0 10650c -10.13 7.58 31.4c 17.2c
T1 11325b -4.43 14.39 34.5b 20.6b
T2 12450a 5.06 25.76 36.3a 26.4a

Table 4

Economic benefits"

试验地点
Experimental site
处理
Treatment
产量
Yield
(kg·hm-2
产值
Output value
(yuan)
肥料
Fertilizer input
(yuan)
人工
Manual input
(yuan)
总成本
Total cost
(yuan)
净收入
Net income
(yuan)
沈阳 CK0 6855 10439 1371 2250 3620 6819
Shenyang CK 10042 15264 2432 2850 4681 10583
CK1 9307 14146 2327 2250 4577 9569
T0 9669 14696 3120 2250 5370 9326
T1 9912 15066 2961 2250 5211 9855
T2 10250 15577 2803 2250 5053 10524
T3 10068 15305 2644 2250 4894 10411
海城 CK0 7300 11096 1031 2250 3281 7815
Haicheng CK 11850 18012 1974 2250 4224 13788
CK1 9900 15048 1879 2250 4129 10919
T0 10650 16188 2656 2250 4906 11282
T1 11325 17214 2416 2250 4666 12548
T2 12450 18924 2176 2250 4426 14498

Fig. 6

Fitting curves of different ratios with resin coated urea on economic benefit, nitrogen fertilizer utilization rate and maize yield"

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