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    不同種類地膜覆蓋對烤煙生長發育和產質量的影響

    原文作者:向鵬華、周孚美、單雪華

    摘要 通過對烤煙大田3種不同覆蓋膜對烤煙的影響比較,結果表明:配色膜覆蓋和普通透明膜覆蓋均可顯著促進烤煙的生長發育,對煙株早期生長有利;其中配色膜覆蓋效果最好,控草效果高達83.5%,產量、經濟效益、化學成分均為最佳,較裸栽和普通透明膜覆蓋處理產值分別高5 070.15、3 421.35元/hm2,化學成分更加協調,可用性更好。
       關鍵詞 地膜覆蓋;烤煙;產質量;生長發育
      中圖分類號 s572 文獻標識碼 a 文章編號 1007-5739(2013)20-0013-01
      地膜覆蓋栽培是目前我國烤煙栽培的主體模式,各地進行了大量的試驗研究,目前已在烤煙生產上大面積推廣應用。地膜覆蓋可以促進煙株前期生長,減輕煙草病蟲害,解決煙株生育前期溫度偏低、生長緩慢的問題,提高煙葉產量和質量[1-2]。但煙草生長期雜草普遍發生,嚴重影響煙株的生長,而且有些雜草還是煙草病蟲害的寄主。目前大面積推廣普通透明膜覆蓋栽培,仍然難以抑制雜草的生長,同時保熱性能不好[3]。因此,該文研究了不同地膜覆蓋對烤煙生長發育和產質量的影響,以期為烤煙合理使用地膜栽培提供依據。
       1 材料與方法
      1.1 試驗品種
      試驗采用云煙87。
      1.2 試驗設計
      試驗在耒陽市東湖鄉進行,土壤肥力中等。試驗共設3個處理,處理1:配色膜(兩側為黑色,中間為灰色);處理2:普通透明膜(厚900 mm);處理3:裸栽(不蓋膜)。www.zhidachem.com3次重復,隨機區組排列。大田生產栽培技術按照《衡陽烤煙綜合標準》進行。[論文網] 
       1.3 調查與統計
      于移栽后60 d每小區取3點調查膜內雜草株數,煙株主要農藝性狀分別在移栽期、團棵期、現蕾期開展調查,同時分小區進行煙葉產質量、產值調查,分別取x2f、c3f、b2f各2 kg進行煙葉化學成分分析,煙樣氮、磷、鉀含量采用常規方法進行測定,煙葉氯、煙堿、淀粉、總糖和還原糖用連續流動分析儀(荷蘭skalar)測定。統計分析采用dps。控草效果計算公式如下:
       控草效果(%)=×100
      2 結果與分析
      2.1 不同處理對雜草控制的效果
      移栽后60 d調查(表1),配色膜控草效果最好,雜草株數降為43株/m2,控草效果達到83.5%;其次為普通膜,除草效果為77.9%。裸栽處理的雜草最多,雜草株數和雜草鮮重分別高達287株/m2和592.5 g/m2。
       2.2 不同處理對烤煙生育期的影響
      試驗結果表明,地膜覆蓋處理煙株長勢快,與裸栽相比,配色膜和普通透明膜的煙株團棵期分別提早了4、3 d;現蕾期分別提早了6、5 d。在不同地膜覆蓋處理中,地膜覆蓋處理的煙株大田生育期比裸栽煙株的大田生育期要短5 d(表2)。
       2.3 不同處理對烤煙農藝性狀的影響
      不同種類地膜覆蓋,其株高、莖圍等煙株農藝性狀有一定的差異,以配色膜最好,裸栽最差,配色膜株高比裸栽處理高6.65 cm,莖圍粗1.0 cm,最大葉面積大567.94 cm2,普通透明膜介于兩者之間(表3)。
       2.4 不同處理對烤煙經濟性狀的影響
      3種不同處理中,以配色膜的煙葉均價、上中等煙比例最高,普通透明膜次之,裸栽最差;處理1產量分別比處理2、3高286.5、427.5 kg/hm2,產值分別比處理2、3高3 421.35、5 070.15元/hm2(表4)。
       2.5 不同處理對烤煙化學成分的影響
      試驗結果表明(表5),各處理對煙葉3個部位的煙葉化學成分有一定的影響。從x2f看,裸栽處理的氮、鉀含量相對較低,磷含量處理間相差不大;尼古丁含量各處理均在適宜的范圍,還原糖含量以處理2較低,處理1最高,為24.56%,糖堿比3個處理則分別是14.11、11.63、13.01,鉀(下轉第15頁)
       氯比均在7~8之間。從c3f看,處理1的淀粉、糖堿比和鉀氯比較適宜,處理2、3的淀粉含量相對較高,糖堿比和鉀氯比較低;上部煙葉,處理3的煙堿含量較高,分別比處理1、2高15.8%、9.4%,淀粉含量以處理3偏高,為5.59%;糖堿比和鉀氯比以處理1最好,處理3較差。總體來看,處理1較好,化學成分更加協調,煙葉的可用性較高;處理3的煙堿、鉀含量都較低,糖堿比和鉀氯比不適宜,煙葉的燃燒性和煙葉品質較差,吸食不好,刺激性較大。
       3 結論與討論
      (1)綜合上述各種因素考慮,在覆蓋配色膜、普通透明膜以及裸栽3個處理中,以配色膜覆蓋栽培控制煙田雜草效果最佳,且顯著提高煙葉產質量和經濟效益,煙葉化學成分更加協調,同時節省勞力,與化學除草相結合可望解決煙田雜草的危害[4-5]。
       (2)通過試驗的開展,總結出一套配色膜覆蓋的技術要點:覆蓋配色膜整體技術要求同普通地膜覆蓋相一致,但要求覆蓋質量比普通透明膜高。移栽前土壤濕度較適宜時初整煙畦,并開16 cm深的條溝施入條溝肥,然后重新整好煙畦。整畦一定要規范,要求壟高達30 cm,要求土塊細碎,壟體飽滿,畦面平直。配色膜覆蓋時要拉緊,讓膜緊貼畦面,膜角要用土壓嚴實。以此為標準,在全市開展了推廣應用。
       4 參考文獻
      [1] 王彥亭,王樹聲,劉好寶.中國煙草地膜覆蓋栽培技術[m].北京:中國農業科學技術出版社,2005.
      [2] 陳乾錦,陳家驊,楊建全.煙田重要雜草不同生活階段發育起點與有效積溫研究[j].江西農業大學學報,2001,23(2):26-28.
      [3] 郭亮.地膜覆蓋對烤煙的生長發育和產質量影響研究進展[j].安徽農業科學,2011,39(10):5755-5756,576.
      [4] 郭利,李婭,曹祥連,等.烤煙地膜覆蓋不同栽培方式試驗研究[j].現代農業利技,2008(16):175-177.
      [5] 許志強.烤煙地膜覆蓋研究進展[j].中國農學通報,2012,28(25):117-123.

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