不同類型高氮復混(合)肥氨揮發特性及其對氮素平衡的影響

李雨繁， 賈 可， 王金艷， 馮國忠， 焉 莉， 鄧 超， 李 輝， 高 強*

(1吉林農業大學資源與環境學院，吉林長春 130118； 2 中國-阿拉伯化肥有限公司農化中心，秦皇島 066000；3吉林省梨樹縣榆臺鎮農業技術推廣站，吉林梨樹 136506)

不同類型高氮復混(合)肥氨揮發特性及其對氮素平衡的影響

李雨繁1， 賈 可2， 王金艷3， 馮國忠1， 焉 莉1， 鄧 超1， 李 輝1， 高 強1*

(1吉林農業大學資源與環境學院，吉林長春 130118； 2 中國-阿拉伯化肥有限公司農化中心，秦皇島 066000；3吉林省梨樹縣榆臺鎮農業技術推廣站，吉林梨樹 136506)

玉米； 一次性施肥； 新型肥料； 氨揮發； 氮素平衡

一次性施肥方式采用的肥料類型主要為含氮量較高的復混(合)肥，如高塔肥料、摻混肥料等。隨著新型肥料生產的快速發展，控釋肥料、脲甲醛肥料和穩定性肥料在一次性施肥中的比例不斷增加。目前在玉米上應用新型肥料的研究主要集中在單一新型肥料增產效果和氮素殘留方面[5-7]，只有少數研究者針對控釋肥料、脲甲醛肥料、穩定性肥料中的其中一種進行了氨揮發狀況的研究[8-9]，就相同養分條件下，對不同類型新型肥料在玉米上的增產效果及氨揮發特性尚不明確，而這方面的研究，對指導東北地區玉米合理施用氮肥具有重要的科學意義。

1 材料與方法

1.1 試驗區概況

圖1 2013年試驗區降雨量及氮肥施用后氨揮發測定期間的溫度和濕度Fig.1 Air temperature, relative humidity and precipitation after the basal application of the nitrogen fertilizers in 2013

1.2 試驗設計

試驗共7個處理：1)對照(N0)，不施氮肥； 2)常規施肥(Con)， 用氮磷鉀比例15-15-15的復合肥+尿素； 3)高塔肥料(HT)； 4)摻混肥(BB)，尿素+二銨+氯化鉀； 5)控釋肥(CRF)，硫包衣復合肥； 6)脲甲醛肥(UF)，脲甲醛樹脂包衣復合肥； 7)穩定性肥料(SF)， 同時添加脲酶抑制劑和硝化抑制劑的復合肥。 除對照外，各處理氮磷鉀比例為28-11-11。各處理施肥量相同，均為N 224 kg/hm2、P2O588 kg/hm2、K2O 88 kg/hm2，每個處理3次重復。小區面積40 m2，6壟一個小區，各小區間隔2 m，作為保護行，以避免各小區間相互污染。各小區排列原則為：施氮量較高的處理位于下風向，施氮量較低的處理位于上風向。施肥方式為： 常規施肥處理的氮肥分為基肥和追肥，基追肥比例為1 ∶2，分別以條施和溝施的方式施入，追肥日期為6月24日(拔節期)，施肥深度為5—8 cm；其他施氮處理均采用一次性條施的方式，施肥深度為10—12 cm。

1.3 測定項目和方法

圖2 氮肥施入后土壤的氨揮發速率 Fig.2 Ammonia volatilization rates from soil after the basal application of nitrogen fertilizers

土壤氨揮發速率的計算公式為：

1.3.3 產量的測定及植株樣品的采集 在玉米成熟期，將試驗小區兩側邊行各1壟及小區兩端各0.8 m去掉，其余部分作為收獲區，面積為22.8 m2。記錄測產面積內實際株數、穗數、果穗總鮮重，按平均單穗重取有代表性的10穗(10穗的平均單穗重應與收獲區的平均單穗重相同)，稱取鮮重帶回實驗室，考種后烘干測干重，計算含水量，折算測產區產量，最后得出每公頃產量(14%)。

在每個小區選擇3株有代表性的玉米植株，裝入網袋帶回實驗室，分為秸稈和籽粒，烘干后全部粉碎，采用常規方法測定植株中的氮含量[12]。

1.4 數據處理

氮肥利用率及氮平衡的計算方法[13-14]：

氮肥利用率(%)=(施氮區吸氮量-無氮區吸氮量)/施氮量×100

土壤氮素凈礦化量(kg/km2)=不施氮肥區地上部分氮積累量+不施氮肥區土壤殘留無機氮量-不施氮肥起始無機氮量

氮表觀損失量(kg/km2)=氮輸入量-氮輸出量

氮肥表觀損失率(%)=氮表觀損失/施氮量×100

氮肥土壤殘留率(%)=100-氮肥利用率-表觀損失率

試驗數據采用SAS進行統計分析。

2 結果與分析

2.1 氮肥施入后土壤的氨揮發

圖3 氮肥施入后土壤的氨揮發累積量 Fig.3 Cumulative ammonia volatilization amount from soil after the basal application of nitrogen fertilizers

2.2 不同類型高氮復混(合)肥對玉米產量及氮素利用的影響

表1 不同氮肥處理的產量及氮肥利用率

注(Note): 同列數據后不同字母表示處理間差異達5%顯著水平 Values followed by different letters in a column are significant among treatments at the 5% level.

差異。CRF、UF、SF 3個處理的氮肥當季利用率分別為27.9%、37.7%和28.8%；植株吸氮量分別為277.5、299.3和279.3 kg/hm2，均高于其他處理，主要原因在于CRF、UF和SF 3個處理的玉米植株含氮量明顯較高(表1)，原因可能是，在本試驗條件下以上3種新型肥料可明顯促進玉米植株對氮素的吸收。

2.3 收獲后各處理不同土層無機氮的分布

圖4 玉米收獲后銨態氮、硝態氮和無機氮在0—100 cm土層的分布 Fig.4 The distribution of -N, -N and Nmin in the 0-100 cm soil profile after the harvest of maize

2.4 不同肥料對土壤-作物體系中氮素平衡的影響

3 討論

3.1 不同氮肥的氨揮發

影響氨揮發的主要因素包括土壤條件、環境因子及施肥狀況[15]。在本試驗條件下，肥料類型和施肥方式是影響氨揮發的2個顯著因素。常規施肥處理的基肥施用量僅為74 kg/hm2，僅占玉米生育期氮肥總施用量的1/3，但其氨揮發速率和氨揮發累積量均明顯高于其他處理，且峰值出現時間較早，但拔節期追施尿素后土壤的氨揮發速率并沒有明顯升高。這與王東、紀玉剛等[16-17]提出的氨揮發速率和氨揮發累積量隨施氮量增加而增加，且玉米追肥后的氨揮發速率和氨揮發累積量均高于基肥期的結論不符。這是由于常規施肥處理的施肥深度與一次性施肥方式相比明顯較淺，肥料施入土壤后迅速溶解并在脲酶的作用下水解，使土體中的氨濃度升高，很容易在短時間內造成氨揮發損失。但在玉米追肥后出現連續降雨，且降雨量達41.73 mm，將施入土壤中的氮素直接淋洗到土壤深層中，表層土壤中的尿素減少，使氨揮發損失降低。控釋肥和脲甲醛肥施入土壤后，包膜材料和緩溶性物質阻隔肥料與土壤脲酶的直接接觸及減少氨揮發底物尿素態氮的溶出，從而達到降低和延緩土壤氨揮發的效果[18-19]。穩定性肥料中的脲酶抑制劑可有效降低脲酶活性，這是其氨揮發較低的重要原因。

表2 施氮量為224 kg/hm2條件下玉米全生育期的氮素平衡

注(Note): 同列數據后不同字母表示處理間差異達5%顯著水平 Values followed by different letters in a column are significant among treatments at the 5% level.

3.2 玉米收獲后土壤無機氮累積與分布

3.3 不同氮肥施用后土壤-作物體系的氮素平衡

在本試驗中，氮肥表觀損失率在氮肥輸出項中占主要地位，各施氮處理的氮肥表觀損失率均大于高強[26]等在黑鈣土上的研究結果，其主要原因在于該試驗地塊土壤自身供氮量已達275 kg/hm2(土壤氮素礦化量與播前無機氮數量的總和)，基本滿足玉米全生育期的氮素需求。由此可以看出，在供試土壤肥力較高的條件下，春玉米一次性施肥方式的氮肥施用量可適當降低，降低幅度有待進一步研究。

4 結論

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Ammonia volatilization characteristics of different kinds of high-nitrogen compound fertilizers and their effects on nitrogen balance

LI Yu-fan1, JIA Ke2, WANG Jin-yan3, FENG Guo-zhong1, YAN Li1, DENG Chao1, LI Hui1, GAO Qiang1*

(1CollegeofResourcesandEnvironmentalSciences,JilinAgriculturalUniversity,Changchun130118,China;2AgrochemicalCenterofChina-ArabianFertilizerCo.Ltd,Qinhuangdao,Hebei066000,China;3AgriculturalTechnologyExtensionStationofYutaiTown,Jilin,Lishu136500,China)

【Objectives】 With development of single fertilization as a main fertilization practice of maize(ZeamaysL.) in northeast China, proportion of high nitrogen compound fertilizers such as controlled release fertilizer, urea formaldehyde fertilizer, and stability fertilizer in the single fertilization increases. In order to clear effects of the yield increase and ammonia volatilization status of different types of high nitrogen compound fertilizers on maize(ZeamaysL.) in the same nutrient condition, a field experiment was conducted in a chernozem with maize(ZeamaysL.) cropping in the center of Jilin Province, China. 【Methods】 The experiment was conducted from May to October 2013 in chernozem soil in the Huangjiawobao village in Lishu County of Jilin Province with 7 treatments, which were the treatment without nitrogen application(N0), conventional fertilizer(Con), the high-tower fertilizer compound fertilizer processed in high tower(HT), bulk blanding fertilizer(BB), controlled-release fertilizer(CRF), urea formaldehyde fertilizer(UF) and stability fertilizer(ST). Each treatment was replicated 3 times. The conventional fertilizer was basal and top-dressed in proportion of 1 ∶2, the other fertilizaters were all basal applicated completely with rate of N, P2O5and K2O in 224, 88, and 88 kg/hm2. The ammonia volatilization was tested by a ventilation methodinsituafter the fertilization. Soil samples in the 0-100 cm soil layer were collected by drilling before sowing and after harvest. The yield of each treatment was weighted, three plants were selected in each plot and divided into straw and grain, the nitrogen uptake was calculated. 【Results】 The nitrogen fertilizer application increases the yields significantly. Compared with N0, the yield increase ranges from 18.9% to 24.1%, there are not significant differences among the different types of fertilizers, and the yield are from 12197 to 12899 kg/hm2. The utilization rates of the controlled release fertilizer(CRF), urea formaldehyde fertilizer(UF), and stability fertilizer(ST) are 27.9%, 37.7% and 28.8%, respectively, and the plant nitrogen uptake amounts are 277.5, 299.3 and 279.3 kg/hm2, respectively, which are higher than those in the other treatments. The ammonia volatilization rates at different periods after the fertilizer application show that the overall rate of ammonia volatilization is firstly increased and then decreased, the differences of ammonia volatilization rates of the treatments mainly concentrate in the 3-13 days after the fertilization, the peak of the ammonia volatilization rate is in oreder: conventional fertilization(Con) > high-tower fertilizer(HT) > mixing fertilizer(BB) > controlled release fertilizer(CRF) > stability fertilizer(ST) > urea formaldehyde fertilizer(UF). The ammonia volatilization amounts of the controlled release fertilizer, urea formaldehyde and stability fertilizer are 10.6, 8.1 and 10.3 kg/km2, respectively, which are equivalent to the amounts of the nitrogen fertilizer in 4.7%, 3.6% and 4.6% and significantly lower than the mixing fertilizer(14.8 kg/hm2) and the high-tower Fertilizer(23.0 kg/hm2). From the nitrogen balance in soil-crop system, it can be seen that the apparent loss amounts of the controlled release fertilizer, urea formaldehyde fertilizer and the stability fertilizer are 103, 79 and 73 kg/hm2, and significantly lower than those of the mixing fertilizer(136 kg/hm2) and high-tower fertilizer(123 kg/hm2). The mixing fertilizer, controlled release fertilizer, urea formaldehyde fertilizer and stability fertilizer improve the nitrogen utilization rate of 7.7%-17.5%, and reduce the nitrogen loss effectively. 【Conclusions】 In chernozem soil and single fertilization mode, the yields of different types of high nitrogen compound fertilizer have no significant differences, which are ranged from 12197 to 12899 kg/hm2. Compared with the mixing fertilizer(BB), the controlled release fertilizer(CRF), urea formaldehyde fertilizer(UF) and stability fertilizer(ST) promote the plant nitrogen uptake, and the utilization rates are improved by 38.1%-86.6%, the ammonia volatilization rates are reduced by 40%-96.5% and the amounts of ammonia volatilization loss are reduced by 39.2%-81.3%. The controlled release fertilizer, urea formaldehyde fertilizer and stability fertilizer effectively keep soil inorganic nitrogen content in corn growth period within an acceptable range and guarantee soil nitrogen supply.

maize; single fertilizer application in one crop season; new type fertilizer; ammonia volatilization; nitrogen balance

2014-01-22 接受日期： 2014-07-07 網絡出版日期: 2015-02-13

公益性行業(農業)專項-農作物最佳養分管理技術研究與應用(201103003)；國家玉米產業技術體系(CARS)項目資助。

李雨繁(1987—)，女，吉林長春人，碩士研究生，主要從事植物營養與肥料方面的研究。E-mail: yufan0511@126.com * 通信作者 E-mail: gyt199962@163.com

S513.062； S153.6+1

A

1008-505X(2015)03-0615-09