Comparatively effects of pressure , tempareture and oxygen tension on photosynthetic and respiratory rtaes in porphyra umbilicalis (L )J, Ag.
ABSTRACT:
Influences of hydostatic pressure (600atm) , temperature (50, 150 and 300 C ) and O2 concentration (3 410 % of air saturation ) of the outer medium were studied on the rate of O2 exchange of porphyra umbilicalis collected from heligoland (north sea ) . the O2 tension acted antagonistically to the pressure effects. The pressure influenced rates of respiration and apparent photosynthetics decreased gradually with a decrease in the O2 concentration and vice versa ; the effects on photosynthesis, however, were lesser than those on respiration. The O2 concentration of 30% was found to be critical, at higher values repiration of the pressure affected algae increased whereas at lower values it decreased as compared to control . At O2 concentration lower than 15% , the rate of O2 exchange decreased very sharply . the pressure influences were retarded by higher and intensified by lower temperatures.

Effect of fast neutrons and
ABSTRACT:
Homogeneous seeds of six varieties of bread wheat , triticum aestivum L.

Some studies on callus formation in rauwolfia serpentine benth.
ABSTRACT:
Introduction and growth of caltus in stem and leaf segments of rauwolfia serpentine was studied using knop’s solution as basal modium (BM) . the effect of auxins, kinetin (Kn), coconut milk (CM) and casein hydrolysate (CH) was studied on induction an growth of

Biochemical inhibition exhibited by datura innoxia M seeds.
ABSTRACT:
Germination studies of datura innoxia seeds showed that the possible factors responsible for the dormancy were hard testa and biochemical inhibitors in the seeds . laboratory bioassays were run to analys the possibility of seed residual toxicity. The leachate, artificial rain-drip , water extracts from whole seed , seed coat and cotyledon proved to be

Effect of (2- chloroethyl ) trimethyl ammonium chloride on the yield of okra . (abelmoschus esculentus).
ABSTRACT:
The ffect of (2-chloroethyl ) trimethyl ammonium chloride(CCC) on the yield of abelmoschus esculentus was studied . seeds of A. esculentus were soaked in 400, 800 and 1200 ppm of CCC for 24 hours. Treatment of okra with 400 ppm did not influence the time taken for flowering and fruit set, 800 and 1200 ppm of CCC delayed the flower intiation and fruit set . number of flowering was not influenced by 800 ppm CCC where as it decreased significantly in 400 and 1200 ppm. 800 ppm produced significantly higher number of fruits . fruit yield increased by 12.55 percent . dry weight of the seeds and number of seeds per fruit indreased slightly but nin0significantly at three concentrations . no significant effect was observed on fruit size.

Comparative effect of sodium chloride and sulphate on
ABSTRACT:
The growth of zea mays L. plants was reduced to the same extent by equivalent concentrations of sodium chloride and sodium sulphate in the

Effect of light and temperature on seedlings raised under sodium chloride salinity.
ABSTRACT:
The growth of wheat (triticum aestivum L) jute (corchorus capsularis L) and maize (zea mays L) cultured on the control and saline (NaCl) media were studied in dark and light. Sodium chloride showed an intensity effect on the growth of seedlings and this effect was enhanced with increase in light intensity and temperature.

Net primary productivity of wheat and barley fields in Peshawar , Pakistan
ABSTRACT:
The net productivity of the fields of wheat and barley was determined . the standing crop of live shoot material was found to be higher in wheat than in barley. The standing crop of dead shoot. Material and total molarity offshoot material was also found to be higher in wheat than in barley. No

The relationships amongst dominance , diversity and community maturity in a desert vegetation
ABSTRACT:
Relationships among dominance , diversity and its components and community maturity were statistically evaluated . dominance and diversity were found to be inversely related . the two components od diversity – richness and equitability were found to be intimately associated with general diversity , and were equally important in governing the overall diversity. Community maturity was negatively correlated with general diversity and its components but was not significantly associated with dominance . the relatinships among the expressions of community organization are discussed.

Blue-green algae of different rice growing soil series of the Punjab.
ABSTRACT:
A survey of blue-green algae of rice growing areas of the Punjab . belonging to 12 different soil series was carried out . of the 103 species belonging to 21 genera, more than 32 species belonging to 10 gnera were heterocystous and are potential nitrogen fixers . they belong to

Possibility of growing two rice crops in one season
ABSTRACT:
The possibility of growing two rice crops in the same field during oneseason has been explored. An early maturing photoperiod intensive variety of fine basmati rice namely Kashmir basmati was used s the experimental material . the first crop of this variety was transplanted in the first week of may and harvested in the third week of august subsequently , the second crop was transplanted in the same field during the fourth week of august and was harvested in the third week of November. Thus leaving sufficient interval for the timely sowing of wheat crop n the same field . the grain yield of first and second crop was 2511.7 and 2610.5kg/ha respectively. The results of this experiment indicate that basmati yield can be doubled by growing two rice crops in one season.

New hosts of broomrape in baluchistan
ABSTRACT:
during the survey carried out in 1978. Apium graveolens and othonnopsis intermedia were recorded as new hosts for orobanche aegyptiaca and O. stockii respectively.