Fertilizing Agricultural Land with Rainbow Trout Manure for Growing Silage Corn1
- J. H. Smith2
Field plots on a Portneuf silt loam (mesic, Durixerollic Calciothids) were fertilized with fish manure at 0, 200, 500, or 800 kg N/ha or NH4NO3 at 0, 100, 200, and 300 kg N/ha for one, two, or three years and planted to corn (Zea mays L.) for four consecutive years. Corn silage yields up to 24 Mg/ha (dry weight) were obtained the first season in 1979 with no significant differences because of the high residual fertility. Highly significant yield increases were obtained the second, third, and fourth season from manure or NH4NO3. The yields were somewhat lower than those obtained the first season. In four years of cropping to corn with manure applied for the first three crops, N recovery for the manure treatments was 18, 28, and 24% of applied manure N for the 200, 500, and 800 kg N/ha applications for three years. In comparison treatments using NH4NO3, N recovery was 90, 59, and 57% for the 100, 200, and 300 kg N/ha treatments. The manure applications at 500 kg N/ha provlded enough N for high corn silage yields and were about equal to the yields obtained with 200 kg N/ha as NH4NO3. Residual N fertility from the manure was greater than from NH4NO3.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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