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- Author or Editor: Victor N. Lambeth x
- HortScience x
Abstract
Clay foam, a recently patented clay-perlite-vermiculite potting mix that dries to a rigid, lightweight structure, has the capability of retaining nutrients, with the exception of NO3 −, over a long period of time due to the ion exchange capacity of the clay fraction. Isobutylidene diurea (IBDU, 31-0-0), ureaform (38-0-0) and oxamide (31.8-0-0) were evaluated as slow-release N sources for clay foam, utilizing ‘America’ spinach (Spinacia oleracea L.) as a greenhouse test crop, at rates of 0.112, 0.225 and 0.337 g N/3600 cm3 clay pot. A basic nutrient formulation, including enough soluble N to cover the lag period between application and release of the fertilizers, was added to the clay fraction prior to mixing. IBDU showed the greatest potential for use in clay foam, as indicated by fresh and dry weights, total N in the dry leaf tissue and low NO3 − accumulation.
Abstract
‘Tuckcross 756P’ is an early, large, pink-fruited three-way hybrid tomato (Lycopersicon esculentum Mill.) that is adapted for greenhouse culture in the northern U.S. and Canada. Since 1971 it has performed well in experiment station and commercial greenhouse trials (2, 3, 4). With early production of good quality fruit, ‘Tuckcross 756P’ is also resistant to fusarium wilt and tolerant to leaf mold.
Abstract
Using ovaries from dormant flower buds of Rhododendron prinophyllum (Small) Millais as a source for micropropagation, shoot and root regeneration were studied in vitro. Ovaries placed on Anderson's rhododendron shoot tip multiplication medium with 4 mg·liter−1 IAA and 15 mg·liter−1 2iP in darkness for 1 month, then under 16-hr cool-white fluorescent light (35–50 μmol·s−1·m−2) regenerated 20-50 shoots/ovary from ovary wall and calli. After three transfers on Economou and Read's shoot propagation medium, hundreds of shoots were produced per ovary. Shoots 1 to 2 cm in length transferred to root induction media resulted in 90% rooting in 1 to 2 months. Rooted plantlets transplanted to potting mixture had nearly 100% survival. Chemical names used: 1H-indole-3-acetic acid (IAA); N-(3-methyl-2-butenyl)-1H-purin-6-amine (2iP).