豬糞尿污泥對盤固草氮的吸收及產量之影響

本試驗的目的在探討盤固草（pangolagrass, Digitaria decumbens）對於污泥中氮的吸收情形及對其生長之影響。本試驗以盆栽進行試驗，肥料施用量依現行標準施用，試驗處理如下：（1）施用化學肥料N：P_2O_5：K_2O = 0：144：300 kg/ha/year，（CK）（2）施用化學肥料N：P_2O_5：K_2O = 400：144：300 kg/ha/year，（Chem）（3）施用化學肥料N：P_2O_5：K_2 O = 200：144：300 kg/ha/year，（1/2 Chem）（4）化學肥料施用如1/2 Chem，另加施用相當1/2 Chem尿素之豬糞尿污泥，（1/2 Chem+1/2 Sludge）（5）不施用尿素，磷肥及鉀肥如Chem，另加施相當Chem尿素之豬糞污泥（Sludge）（6）不施用尿素，另加施相當1/2 Chem尿素之豬糞尿污泥，磷肥及鉀肥如Chem（1/2 Sludge）。試驗結果顯示；收割四次的總乾物產量，以Chem處理及1/2 Chem+1/2 Sludge處理乾物產量最高，其次分別為1/2 Chem處理、Sludge處理、1/2 Sludge處理及CK處理。Chem處理在每一次收割中均維持較高產量，施用污泥的各處理產量隨著割次的增加而提高。盤固草對氮之吸收量，除了CK處理隨著割次的增加而降低外，其餘各處理均隨著割次的增加逐漸提高氮的吸收量。其總吸收量以Chem及1/2 Chem+1/2 Sludge較高。氮吸收及乾物產量相對指標均顯示，污泥與化學肥料合併施用可促進氮的吸收量及提高乾物產量。一年內氮之表觀回收率以施用化學肥料處理（Chem及1/2 Chem）較施用污泥各處理（1/2 Chem+1/2 Sludge，1/2 Sludge及Sludge）為高，而污泥及化學肥料配合施用可提高氮之表觀回收率。施用污泥的各處理其土壤之pH值、有機質、全氮、有效性磷、可抽出性鈣及鎂等均顯著提高，銅則未有顯著性差異。

關鍵字

盤固草；豬糞尿污泥；氮的吸收；乾物產量；土壤性質

並列摘要

The objectives of this study were to determine the effects of applying hog waste sludge on nitrogen uptake and dry matter yield of pangolagrass (Digitaria decumbens). The experiment was conducted with pot experiment under different fertilizer treatments as follows: 1. no N fertilizer and chemical fertilizer with P_2O_5: K_2O = 144:300 kg/ha/year (CK), 2. chemical fertilizer with N:P_2O_5:K_2O = 400:144:300 kg/ha/year (Chem), 3. chemical fertilizer with N:P_2O_5:K_2O = 200:144:300 kg/ha/year (1/2 Chem), 4. half N of treatment Chem replaced by hog waste sludge (1/2Chem + 1/2 Sludge), 5. N of treatment 1/2 Chem replaced by hog waste sludge (1/2 Sludge), 6. N of treatment Chem replaced by hog waste sludge (Sludge). Both treatment Chem and 1/2 Chem + 1/2 Sludge produced the highest dry matter yield for 4 cuts. The treatment Chem produced the highest forage yield at each cut. The forage yields of treatments applied with sludge (1/2 Chem + 1/2 Sludge, 1/2 Sludge and Sludge) were increased when cutting at different regrowth cycles advanced. The amounts of nitrogen uptake of pangolagrass for all the treatments were increased when cutting at different regrowth cycles advanced except for treatment CK. Both treatment Chem and 1/2 Chem + 1/2 Sludge had higher total amounts of nitrogen uptake than the other treatments. The relative indices of nitrogen uptake and dry matter yield showed that the treatments applied with sludge and chemical N fertilizers simultaneously enhanced the nitrogen uptake and dry matter yield of pangolagrass. The treatments applied with chemical N fertilizer (Chem and 1/2 Chem) had higher percentages of apparent N recovery in pangolagrass than those applied with hog waste sludge (1/2 Chem + 1/2 Sludge, 1/2 Sludge and Sludge) one year after treatment. The pH values and the contents of organic matter, available P, exchangeable Ca and Mg were increased in soil when hog waste sludge was applied.

並列關鍵字

Digiteria decumbens ； Hog waste sludge ； Nitrogen uptake ； Dry matter yield ； Soil property

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