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Figure 4

From: Sulfur-enriched leonardite and humic acid soil amendments enhance tolerance to drought and phosphorus deficiency stress in maize (Zea mays L.)

Figure 4

Leaf phosphorus [P; (A)] concentration and leaf acid phosphatase [APA; (B)] of maize plants grown under phosphorus and water deficiency stresses applied individually or in combination with or without soil amendments (SA1 and SA2). Mean ± S.E.; Mean pairs with different letters are significantly different (P < 0.05) by Duncan’s multiple range test. (C) Control treatment (Well-watered; plants were irrigated every day at 100% A pan (Epan) evaporation, and adequate P, 125 kg P/ha); PS: phosphorus deficiency stress (62.5 kg P/ha); WS: water stress (Plants were irrigated once every 3 days at 67% A pan (Epan) evaporation); NSA: No soil amendment; SA1: 625 kg sulfur (S) + 750 kg leonardite/ha; SA2: 1250 kg S + 37.5 kg/ha humic acid.

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