The Laelias (Cattleyas & Their Relatives) by Carl L. Withner

By Carl L. Withner

First introduced in 1998 as "A booklet in Six Parts," this enormous sequence is now whole. the ultimate quantity comprises taxonomic and nomenclatural adjustments affecting species lined within the prior models, in addition additions and alterations.

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Since by definition a full season cultivar for any location requires the entire growing season, normal maturation would not occur in an average season before the first killing frost. Soybean cultivars are adapted to rather narrow ranges of latitude because of responsiveness to photoperiod. Adaptability of a cultivar could be expanded geographically if it were less sensitive to photoperiod. Poison (1972) has identified several genotypes insensitive to day length which flower about 30 days after emergence on photoperiods between 12 and 24 hours.

For those crops with an optimum LAI, lower leaves are apparently parasitic and require photosynthates for maintenance by translocation from active upper leaves. , 1966; Buttery, 1969). 0 but does not decrease at greater LAI values. High plant populations and narrow row spacings favor attainment of maximum LAI's. However, maximum LAI's may not always give rise to maximum seed yield. Weber et al. (1966) reported maximum seed yield occurred at LAI less than the LAI for maximum dry matter production.

Hicks traffic on both sides of a soybean row causes 30% fewer nodules and 3 6 % less mass than in rows with wheel traffic on only one side. Compaction also reduces nodule mass in the upper 30 cm of the soil profile. Nelson et al. (1975) studied the effect of compaction of a sandy loam soil on the soybean root system and seed yield. Resistance to penetration increased, the root systems were restricted and seed yields were reduced by all compaction treatments compared with no compaction. Cropping practices may also affect root and nodule development of soybeans.

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