Organic Food Thesis Essay - 308 Words - StudyMode
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Since the body of literature summarized in this document covers more than five decades, perceptions regarding fertilizer use, its impact on the crop, and possible environmental consequences have changed. Use of soil testing was sporadic in the literature, however, if available, soil-test values are reported. This document does not attempt to calibrate the soil- testing procedures used at the UF/IFAS Everglades REC laboratory or the UF/IFAS Extension Soil Testing Laboratory in Gainesville. However, this document includes tables that couple fertilizer rates with soil test results.
On a Pahokee muck with an initial pH of 7.0, various acidifying materials including elemental S were evaluated for effects on radish production (Lockhart and Sanchez, 1989). Phosphoric acid, ammonium sulfate, ammonium nitrate, and urea ammonium nitrate, applied at 2000 lb per acre reduced soil pH more compared to elemental S. Maximum pH reduction (to 6.0) occurred with ammonium sulfate 41 days after application. Acidification had no effect on radish yield; however, there was a linear increase in split radishes as pH increased from 6.0 to 7.0. Interpretation of results of this study is difficult because effects of fertilizer sources also on soil pH is confounded with variable effects of fertilizer sources on soil-soluble salt and nitrogen status. In addition, the imposed variable, soil-soluble salt conditions, probably led to unpredictable effects on soil pH measurement. In another radish study, reducing pH below 6.0 increased radish yield (Beverly, 1986). Foliar Mn was effective in increasing radish yield, and some acidifying sources increased yield even more when used in combination with foliar Mn.
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Little research has been conducted for K fertilization of sweet corn. In one study, on a soil with a K index of 58, the maximum response was to 80 lb K2O per acre (Forsee et al., 1950). In another study on a soil with an acetic acid extractable K index of 127, there was no response to K fertilization. In two other studies on soils with K indices of 58 and 80, there were no responses to K fertilization (Forsee et al., 1952).
Based on above research, the maximum K recommendation is 300 lb K2O per acre. Guzman (1969) showed that applying all K broadcast before planting was acceptable during dry growing seasons. Split-applications were better during the fall season when rainfall might leach K. Since K can leach and since rates as large as 300 lb K2O per acre could lead to soluble salt injury to plants, the K applications should be split into three portions. One-third should be broadcast before planting and the remainder can be applied in two side dressings one and two months after transplanting (Forsee and Hoffman, 1948; Guzman, 1969). The first sidedressing can be applied in bands two to three inches to the side and two to three inches deep. The last sidedressing can be applied at the same depth in the center between the rows (Guzman, 1969). The soil test values for K fertilization of celery are presented in Table 5.
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High yields and normal plant micronutrient concentrations in leaves were achieved on soils with pH in the range of 5.7 to 5.9 (Burdine et al., 1977). Although little research has been done with romaine lettuce on soils with pH outside this range, a desired pH range of 5.0 to 6.0 was suggested by Sanchez (1990).
Yield of endive was better where S was used to reduce the pH from 6.1 to 5.7 (Forsee et al., 1950). Escarole yields increased as soil pH at harvest was reduced over the range of 6.6 to 5.6 (Burdine and Guzman, 1968). Similar results were obtained in other studies with escarole (Burdine and Guzman, 1965b). The above studies support a desired pH range of 5.0 to 6.0.
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Burdine, H. W., and V. L. Guzman. 1965a. The response of some green celery varieties to pH adjustment with sulfur on Everglades organic soil. Proc. Fla. State Hort. Soc. 78:148-155.
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Burdine, H. W., and V. L. Guzman. 1960. Fertility studies with vegetable crops on the organic soils of the Everglades. Fla. Agr. Exp. Sta. Ann. Report. p. 282.
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Allison, R. V., O. C. Bryan, and J. H. Hunter. 1927. The stimulation of plant response on raw peat soils of the Florida Everglades through the use of copper sulfate and other chemicals. Fla. Agr. Exp. Sta. Bull. 190.
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Both the water and M-1 methods are sensitive to soil pH, especially when the pH exceeds 6.5. The acids that comprise the M-1 extractant are partially neutralized by carbonates within the soil, decreasing the chemical effectiveness of the M-1 to that of water. To that end, research with extractants, such as the Mehlich-3 and a modification of the 0.5 M acetic acid methods, has been initiated (Hanlon and Neal, unpublished data for vegetables; Anderson et al., 1990). These initial research efforts appear to confirm that the Mehlich-3 and modified acetic-acid methods are satisfactory extractants over a wider soil-pH range than either the M-1 or water extractants. However, in five field studies in the Lake Apopka region (Crnko et al., 1993) with a range in soil pH from 5.3 to 6.2, the M-1 correctly identified soils with high levels of P. No response to fertilizer P was predicted, and no crop response (sweet corn and carrots) was found.
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The use of other extractants for determining fertilization need is an ongoing research effort. For example, the Mehlich-1 (M-1) extractant has been in use at the UF/IFAS Extension Soil-Testing Laboratory, Gainesville, since the late 1970s (Hanlon et al., 1990), (Table 6). The effective use of this extractant continues to be a focus of numerous field studies on mineral soils (Hanlon and Hochmuth, 1992). Additional work with this extractant on a muck soil (pH=5.0) in the Fellsmere, FL, area showed that the M-1 accurately predicted lettuce response during several seasons (Diaz et al., 1988). However, on soils with a wider range in soil pH, the M-1 and water extraction methods were not as effective as the Mehlich-3 extractant (Sanchez and Hanlon, 1990) in predicting lettuce response in the Everglades Agricultural Area.
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Maximum K fertilization recommendations for radish are 100 lb K2O per acre on a "per crop" basis to be broadcast before the crop. The acetic acid extractable K soil test values and K fertilization recommendations are presented in Table 5.
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