Organic matter amendments to a calcareous forest nursery soil |
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| Authors: | J G Mexal J T Fisher |
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| Institution: | (1) Department of Agronomy and Horticulture, New Mexico State University, 88003 Las Cruces, N.M, USA |
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| Abstract: | Organic amendments were added to a southwestern United States forest nursery sandy loam soil to determine the effects on soil nutrient reserves and subsequent growth of 1.5+0 ponderosa pine (Pinus ponderosa Laws.) seedlings. Treatments included irradiated sewage sludge, peat moss and pine bark each at 67 t/ha, sawdust at 43 t/ha, and a control that received no organic matter. Sludge caused immediate increases in soil nutrients, especially N and P. Sawdust resulted in near complete N immobilization 45 d after application. Peat moss and bark did not significantly alter soil nutrients. All treatment effects disappeared within 6 months of application.Amendments did not significantly alter seedling survival, biomass or yield (caliper  3 mm). Seedling biomass was positively correlated with early soil nutrient status, but growth was not significantly improved. The modest, short-term nutritional benefits indicate single applications of organic amendments are ineffective in improving the nutrient status of sandy nursery soils of the Southwest. |
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| Keywords: | Pinus ponderosa reforestation fertilization sewage sludge |
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