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  • Author or Editor: P. B. Hoyt x
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Abstract

Field experiments of chelated-or Epsom salt-Mg sprays in 1981 and 1982 on ‘Delicious’ (Red King and Starking strains) and ‘McIntosh’ apple trees (Malus domestica Borkh.) indicated that a minimum of 2 x 2.8 kg Mg/ha, foliar-applied, was necessary to increase leaf-Mg concentration to desired 0.26% levels in ‘McIntosh’. Thus, label-recommended application rates for chelated Mg (2 x 0.56 kg Mg/ha) were too low. ‘McIntosh’ extension growth was increased by adequate foliar-Mg applications, although leaf Ca was reduced in 1 year by the foliar-Mg treatments.

Open Access

This experiment was designed to compare best management practices for conventional and conservation tillage systems, chemical IPM vs. organic vegetable production, and rotation effect on tomatoes. Three vegetables were grown under these management practices with sweet corn (1st year) and fall cabbage or cucumber (2nd year), and fall cabbage on half of the field plots and tomatoes on the other half. The treatments were: 1) conventional-tillage with chemical-based IPM; 2) conventional-tillage with organic-based IPM; 3) conservation-tillage with chemical-based IPM; 4) conservation-tillage with organic-based IPM; and 5) conventional-tillage with no fertilizer or pest management (control). This poster describes sweet corn, cabbage, and cucumber yields from the various treatments over two 3-year rotations. Sweet corn yields were 34% higher in treatments with chemical fertilizer and pest control than with organic methods. Ear worm damage was high (58%) in the organic treatment compared to the chemical IPM program (14%). Fall cabbage was planted after sweet corn and cucumber harvest (all treatments were reapplied). Marketable cabbage yields were in the order: conventional-tilled-organic > strip-tilled-chemical > conventional-tilled-chemical > strip-till-organic > control for both years. Percent culls (< .9 kg heads) were in reverse order of marketable heads. Cabbage insect control was similar in chemical IPM and organic management. Cucumber yields were in the order: conventional-tilled-chemical > conventional-tilled-organic = strip-till-chemical > strip-tilled-organic > control for both years. Insect damage on cucumber fruit was 51% for organic systems and 1% for chemical methods of production. No differences were seen between tillage system within the same production system (chemical vs organic).

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