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- Author or Editor: E. D. Threadgill x
- HortScience x
Abstract
The disk, deep turn and rip-bed methods of land preparation resulted in soil strengths of 1000 kPa or greater at depths of 10, 28 and 18 cm, respectively. The disk and deep turn treatments produced a relatively uniform soil strength across the seed bed at all depths while the rip-bed treatment resulted in a channel of low strength soil under the row with relatively high soil strengths 15 cm to each side. Root growth generally followed the same pattern as soil strength. Shelled pea yield was greatest with the deep turn tillage method and lowest with the disk tillage method. The greater yield was due to a combination of a larger yield per plant and a slightly greater plant stand with the deep turn tillage method. Nutrient use efficiency as determined by total nutrient uptake by plants of the rip-bed and deep turn treatments was 40 and 50% greater than those from the disk treatment.
Abstract
Activated charcoal was applied as a spot treatment on soil surface over the seed of watermelon [Citrullus lanatus (Thunb.) Matsum & Nakai, cv. Charleston Gray]. Planting and charcoal application were done simultaneously with specially developed equipment. Activated charcoal at 358 kg/ha fully protected watermelon from terbacil (1.12 kg/ha) injury but provided only partial protection from atrazine (2.24 kg/ha) injury. Spot application of activated charcoal did not result in decreased weed control.