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- Author or Editor: Harry J. Mack x
- HortScience x
Abstract
Increased plant population and a decrease in rectangularity (arrangement of plants in a more uniform or square pattern) have resulted in increased yield of bush beans (Phaseolus vulgaris L.) (Atkin, 1961; Goulden, 1976; Jones, 1969; Mack and Hatch, 1968). Mack and Hatch (1968) reported an average yield increase of 17% for two bush green bean cultivars in a 15-cm-square arrangement (rectangularity of 1:1), as compared with plants in 91-cm rows (rectangularity of 1:36). Double rows were not evaluated. Kueneman et al. (1979) found that narrow-row planting of dry beans produced higher yields than wider rows, but there was no difference in yield between double rows 10 cm apart as compared with single rows of 38 and 76 cm. It may be impractical to plant accurately in a square arrangement of 15 × 15 cm, for example, compared to wider rows, and this type of planting may result in higher incidence of white mold (Sclerotinia sclerotiorum) disease (Steadman et al., 1973).
Abstract
‘Jubilee’ sweet corn (Zea mays L.) was grown under conventional tillage, strip tillage, and no-till methods in 1983 with 5 irrigation levels imposed on each tillage treatment. The crop-water production functions for evapotranspiration vs. yield were different in scale but similar in slope for the 3 tillage treatments. At each level of seasonal applied water, the conventional tillage produced significantly higher yields of husked sweet corn than did strip tillage, and strip tillage yields were significantly higher than those of no-till.
Abstract
Mulching ‘Puebla 152’ beans with rice hulls to a depth of 4 cm reduced afternoon soil temperature, soil temperature fluctuation, and slowed the loss of soil moisture. These effects were greatest prior to canopy closure. Fresh weight of nodules, roots, stems, leaves, and total plant increased 50%, 38%, 49%, 24%, and 38%, respectively, with mulching, but pod and final seed weight were unaffected. Mulching had little effect on the concentration of soluble and insoluble carbohydrates. N2 fixation rates (C2H2 reduction) were low (≤ 0.6 µmole/plant per hr) but were as much as 3 times higher in mulched than unmulched plants.