The effects of endosulfan and fertilizer source on soil fertility

The Effect of MSW Compost and Fertilizer on Extractable Soil Elements, Tuber Yield, and Elemental Concentrations in the Plant Tissue of Potato

“…Plant Mn (shoot and root) was highest in the NPK-fertilized plots, while shoot K, Cu, and Zn were highest in MSW3 plots. The result for Mn is in agreement with Warman and Fairchild (1983), who found higher Mn in fertilizer treated 'Superior' tissue compared with composted farmyard (2009) study for squash, where the tissue from the NPK plots was always higher in Mn. We suspect the higher tissue Mn in NPK plants was directly related to the lower pH found in the NPK plots in the above-cited studies as compared with the plots receiving compost.…”

“…In the first 2 years of this study, elemental analysis of mature tubers was evaluated (data not shown) and no treatment differences in tuber elemental concentrations were found; similar results were also reported by Warman and Fairchild (1983) and Alvarez et al (2006). Warman and Havard (1998), however, found higher tuber P (3 years), K, S, and Mg (2 years) in compost-treated plots in comparison to fertilizer treated plots.…”

“…Warman and Havard (1998) also found higher leaf tissue Mg in fertilizer treated plots; however, tuber Mg was higher in compost-treated plots. In contrast, Warman and Fairchild (1983) found higher tissue Mg in the plants of compost-treated potatoes grown in an organic soil in comparison to a fertilizer treatment. We do not have a good explanation for the fact that plant Ca and Mg was lowest in the MSW plots given the strong contribution of these nutrients from MSW to these soils (Tables 1 and 4).…”

“…Nitrogen concentrations were significantly higher in NPK and MIX plots than in any compost plots, and this is in accordance with the finding that in sweet corn, whole plant N was also higher in NPK plots than in MSW compost plots (unpublished research). Warman and Fairchild (1983) also found higher potato tissue N concentration in fertilizer treated plots on clay and organic soils compared with a compost treatment, as did Warman and Havard (1998) in a comparison of fertilizer and composted manure in a 3-year study on Pugwash sandy loam. In the present study, Mg was also highest in NPK-fertilized plants in all 3 years of the study, and in NK plots in 1997 and MIX plots in the last year.…”

“…Although various types of farmyard manure-based composts have been extensively evaluated for potato production (Warman and Fairchild 1983;Warman and Havard 1998;Roinila et al 2003;Alvarez et al 2006;Liu 2006;Lynch et al 2008;Willekens et al 2008), the use of MSW compost has not been widely studied for potato crops and soils (Sebastiao et al 2000;Hargreaves et al 2008). Abad et al (1997) found that when a combination of solid urban waste compost (similar to MSW compost) and N fertilizer were applied to plots well supplied with additional P and K fertilizer, potato yields were high enough from the combination of the two amendments that a grower would not need to apply additional N fertilizer.…”