Search Results

You are looking at 1 - 5 of 5 items for

  • Author or Editor: Mohsen Dkhili x
Clear All Modify Search

Five early maturing pigeonpea (Cajanus cajan) genotypes; ICPL 146 1985HK, ICPL 87 Isolation (85K), ICPL 85010, ICPL 85024 and ICPL 8304 were evaluated in a growth chamber study and in a greenhouse/outdoor study. Genotypes grown in growth chanter at 25/15°C, day/night with 14 hour photoperid and light intensity of 480 μEm-2sec-1, produced 5-7 main stem branches within the first 7 weeks and flowerd within 54-65 days. Those grown at the same conditions but with 10°C night temperature produced only 1-4 branches in the same period and flowered between 65 and 79 days. Plants grown in the greenhouse in the fall when photoperiod was 13½ hours, and temperature ranged from 31-42°C during day and 9-18°C during night flowered in 55 to 65 days. These plants grew faster than those started outdoors, where average weekly temperature was below 10°C for 4 of the 5 weeks before their transferal to the greenhouse and eventual flowering between 75 and 94 days. Some outdoor seedlings experienced epicotyl damage by a -1°C cold and these initiated shoots from axillary buds on underground nodes and flowered within 98–101 days.

Free access

Five early maturing pigeonpea (Cajanus cajan) genotypes; ICPL 146 1985HK, ICPL 87 Isolation (85K), ICPL 85010, ICPL 85024 and ICPL 8304 were evaluated in a growth chamber study and in a greenhouse/outdoor study. Genotypes grown in growth chanter at 25/15°C, day/night with 14 hour photoperid and light intensity of 480 μEm-2sec-1, produced 5-7 main stem branches within the first 7 weeks and flowerd within 54-65 days. Those grown at the same conditions but with 10°C night temperature produced only 1-4 branches in the same period and flowered between 65 and 79 days. Plants grown in the greenhouse in the fall when photoperiod was 13½ hours, and temperature ranged from 31-42°C during day and 9-18°C during night flowered in 55 to 65 days. These plants grew faster than those started outdoors, where average weekly temperature was below 10°C for 4 of the 5 weeks before their transferal to the greenhouse and eventual flowering between 75 and 94 days. Some outdoor seedlings experienced epicotyl damage by a -1°C cold and these initiated shoots from axillary buds on underground nodes and flowered within 98–101 days.

Free access

Determinate, photoperiod-insensitive genotypes of pigeonpea, (Cajanus cajan) have the potential for production in the short growing season of the temperature region. A field study was conducted to determine the effect of three planting dates on the growth and development of this crop in Missouri. Seeds of four genotypes, ICPL 87 Isolation (85k), ICPL 85010, ICPL 85024 and ICPL 8304 were planted at three planting dates in 1990, May 1, May 15 and May 31. Germination of the earliest planted seeds was low but increased in the later planted ones. The earlier the planting date the longer was the time to flowering, but the earlier was pod maturity. The earliest planted group flowered within 78-110 days after planting. The genotypes in this group produced the highest fresh pod weights of 330-730 g/plant and the latest planted ones produced the least. Pod length, the number of seeds per pod and weight of 100 seeds had ranges of 5.1-5.9 cm, 3-4 seeds and 17-23 g, respectively and were unaffected by planting dates.

Free access

Twenty cowpea (Vigna unguiculata) and 10 early maturing pigeonpea (Cajanus cajan) genotypes were grown at 20/10 C, and 17/10 C day/night and 16 hr. photoperiod to assess their germination and growth. At 20/10 C eighteen cowpea genotypes including the line MN13, and the cultivar, Pinkeye Purple Hull commenced germination at 6 days after planting and showed at least 80% germination 21 days later. Generally, genotypes did not differ significantly in germination and seedling growth up to 45 days later. At 17/10 C two of the cowpea genotypes IT 82E-16 and IT 84E-124 attained at least 90% germination within 21 days after planting. Seedling, growth of these genotypes did not differ and plants began to die 70 days after planting. The pigeonpeas at 17/10 C commenced germination at 9-10 days like many of the cowpeas. Most had at least 50% germination and did not differ in shoot elongation and leaf production. All pigeonpeas flowered between 109 and 136 days after planting and produced pods with immature seeds.

Free access

Chemically fixed nitrogen is a costly import for Caribbean Basin Countries. Increased cost of fertilizer only serves to reduce crop yields in these areas. This greenhouse research was undertaken to evaluate the N2 fixing capabilities and yield potential of several Phaseolus vulgaris lines developed for use in Caribbean Basin countries. Ten common bean lines from breeding programs at the Universities of Puerto Rico and Wisconsin and two efficient Rhizobium phaseoli strains were used for the study. Plants treated with Rhizobium UMR 1899 and UMR 1632 had significantly higher stem and leaf dry weight than the control plants. Bean lines WBR 22-34, WBR 22-50, WBR 22-55, PR9056-98B and the cultivar Coxstone showed increased dry matter accumulation over that of the control plants. Plants treated with the Rhizobium strain UMR 1899 had the highest stem and leaf dry matter accumulation. Nodulation was significantly higher when plants were treated with UMR 1632. The lines WBR 22-34 and PR 9056-98B produced more nodules than the other lines used. Pod yield as measured by number of immature pods was highest for PR 9056-98B when inoculated with Rhizobium UMR 1899.

Free access