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Chemical and Biological Technologies in Agriculture
Fig. 6 | Chemical and Biological Technologies in Agriculture

Fig. 6

From: Impact of organic fertilization by the digestate from by-product on growth, yield and fruit quality of tomato (Solanum lycopersicon) and soil properties under greenhouse and field conditions

Fig. 6

Effects of fertilization types on soil enzyme activities in field and greenhouse conditions. a: Urease activity; b: protease activity; c: sucrase activity; d: nitrate reductase (NR) activity. Means (± SE, n = 3) with the same letter in the same cultivation condition are not significantly different from each other (p < 0.05). CK represents the control treatment with no fertilizer; NPK represents the NPK (14:14:14) fertilizer treatment with 180 kg N ha–1; D represents the digestate treatment with 180 kg N ha–1; NPK–D represents the NPK (14:14:14) fertilizer with 90 kg N ha–1 and 90 kg N ha–1 of digestate

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