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Recycling of Residual Soil Nitrogen in a Lowland Rice–Sweet Pepper Cropping System

^a Soil Microbiol., Soil and Water Sci. Div., IRRI, P.O. Box 3127, Makati Central Post Office, 1271 Makati City, Philippines
^b Div. of Soil Sci., Nepal Agric. Res. Council, Khumaltar, Lalitpur, Nepal

View larger version (28K): [in a new window]   Fig. 1 Effect of fertilizer and residue alone or in combination with prilled (PU) or tablet urea (TU) on levels of NH4–N at 15 days after transplanting, rice N uptake, and rice grain yield at Site 1. Treatments with the same letter are not significantly different by DMRT at . Fertilizer indicates the average of two fertilizer treatments: prilled and tablet urea; Residue indicates the average of three residue treatments: indigo, indigo plus mungbean, and maize residues; §Residue + PU is the average of three residue plus prilled urea treatments: indigo residue plus PU, indigo and mungbean residue plus PU, and maize residue plus PU; ¶Residue + TU is the average of three residue plus TU treatments: indigo residue plus TU, indigo and mungbean residue plus TU, and maize residue plus TU

View larger version (25K): [in a new window]   Fig. 2 Soil NO3–N during the rice crop as affected by different catch crop residues and fertilizer combinations (selected treatments), and time at 7 d before transplanting (DBT), and 15, 29, 60, and 90 d after transplanting (DAT) in Site 1. (Horizontal bars represent LSD at 0.05% for treatment comparison within each depth and sampling date.) T, Treatment number; 0N, zero nitrogen; PU, prilled urea; TU, tablet urea

View larger version (42K): [in a new window]   Fig. 3 Nitrate–N in soil layers of 25 cm in treatments with no N (0 N), prilled urea–N and indigo residue–N at five sampling dates at Sites 3, 5, and 7. (Horizontal bars represent LSD at P < 0.05 for treatment comparison within depth, site, and sampling.)

View larger version (27K): [in a new window]   Fig. 4 Daily rainfall and water-filled pore space at Magnuang, Ilocos Norte, Philippines, in 1995