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Nitrogen Use Efficiency of ¹⁵N-labeled Poultry Manure

Danish Inst. of Agric. Sci., Dep. of Agroecology, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark

View larger version (26K): [in a new window]   Fig. 1. Atom% 15N of NH4–N and total N in poultry manure during the feeding period. The feed was 15N-labeled from Day 6 and onward. Standard errors (n = 6) are indicated.

View larger version (34K): [in a new window]   Fig. 2. Grain yield of spring barley in the first growth season after application of poultry manure (black bars), mineral fertilizer (gray bars), or no N (white bars). Standard errors (n = 3) are indicated. Bars denoted with the same letter are not significantly different (P = 0.05).

View larger version (48K): [in a new window]   Fig. 3. Dry matter yield of ryegrass grown after application of poultry manure, mineral fertilizer, and no N. Bars are divided into ryegrass harvested in the year of sowing (black) and cumulative ryegrass yield of the three cuts in the second (gray) and third (white) year after initiation of the experiment. Standard errors are shown for the cumulative yield (n = 3). Bars denoted with the same letter are not significantly different (P = 0.05).

View larger version (30K): [in a new window]   Fig. 4. Nitrogen uptake in grain (black bar) and straw (white bar) of spring barley in the first growth season after application of poultry manure, mineral fertilizer, and no N. Standard errors are shown for the cumulative N uptake in grain and straw (n = 3). Bars denoted with the same letter are not significantly different (P = 0.05).

View larger version (50K): [in a new window]   Fig. 5. Nitrogen uptake in ryegrass grown after application of poultry manure, mineral fertilizer, and no N. Bars are divided into N uptake in ryegrass harvested in the year of sowing (black) and cumulative N uptake in ryegrass in the three cuts in the second (gray) and third (white) year after initiation of the experiment. Standard errors are shown for the cumulative N uptake (n = 3). Bars denoted with the same letter are not significantly different (P = 0.05).

View larger version (45K): [in a new window]   Fig. 6. Cumulative 15N recovery in spring barley (grain and straw) and ryegrass 3 yr after application of 15N-labeled poultry manure and mineral fertilizer. Standard errors (n = 3) are indicated.