“…to the lodging of plants which produced much more regrowth and crowding which resulted in reduced yields. Ufer (11) has suggested that flowers from plants grown on moist soils are more difficult to trip. The work of Pedersen (2) suggests that reduced nectar secretion accompanying the reduced temperatures of the plots irrigated during blossom might retard pollination and seed setting.…”
Synopsis
Equivalent mean soil moisture suction between 2 and 8 bars is optimum for alfalfa seed production provided the soil is kept continuously moist until time of blossoming and irrigation water is not applied during the period of heavy bloom.
“…to the lodging of plants which produced much more regrowth and crowding which resulted in reduced yields. Ufer (11) has suggested that flowers from plants grown on moist soils are more difficult to trip. The work of Pedersen (2) suggests that reduced nectar secretion accompanying the reduced temperatures of the plots irrigated during blossom might retard pollination and seed setting.…”
Synopsis
Equivalent mean soil moisture suction between 2 and 8 bars is optimum for alfalfa seed production provided the soil is kept continuously moist until time of blossoming and irrigation water is not applied during the period of heavy bloom.
“…It seems possible that under conditions favorable for pollen collecting, there would also be a transition from the nectar tripper phase in which pollen is a by-product to a phase of purposeful collection of pollen during which nectar is gathered only at intervals. The possibility that there is a relation between the transitional phases of pollen and nectar collection and environmental factors such as relative humidity should be investigated ( 15). It is apparent that the pollen and nectar gathering activities of bees on alfalfa are• difficult to study and not yet well understood.…”
was to discover a fundamental basis for differences in attractiveness of various clones of alfalfa to bees. That clone C-11 was especially attractive to several species of leaf-cutting bees (Megachile) had been observed previously
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