Salinity induced changes in the growth and chemical composition of potato
ABSTRACT:
Potato cv. Patrones , cardinal , multa , red bed , norland, chieftain and red lasoda were grown in soil containing various concentrations of salts at par with saline soils of Pakistan. Lower concentration of salts upto 0.4% were promotory in tuberization whereas higher salinity levels of 1% were inhibitory. Protein contents of tubers increased at low and decreased at high salinity levels in all potato varieties . total sugar content of tubers increased with increasingly concentrations of salts . in red bed total chlorophyll content decreased with increasing salt concentrations while in rest of the varieties the reduction was observed above 0.4% salt level. Total glycoalkaloids (TGA) level in all the

Effect of salinity on carbon and nitrogen transformations in soil.
ABSTRACT:
Powderd plant tops of diplachne fusca and sesbania aculeate were mixed with soil and incubatd at 27- 300 C for 90 days to study the effects of different salinity levels on C and N mineralization, humus formation , humification productivity and soil microflora. The results indicate that increasing salinity depressed the rate of carbon mineralization and its transformation into stable organic matter. Similarly the fungal and bacterial population was also suppressed . however, ammonia volatilization increased with the increase in salinity resulting in greater nitrogen losseswhich were more in case of Saculeata amendment than D.fusca.

Sodicity effects on growth and chemical composition of
ABSTRACT:
Sodicity tolerance tests on kallar grass (diplachne fusca) were carried out in a pot experiment to evaluate

Effect of age and nitrate concentration on nitrate reductase activity in different parts of corchorus capsularis L. seedlings
ABSTRACT:
Response of corchorus capsularis L. seedlings to various concentration of nitrate were evaluated in terms of variation in nitrate reductase activity , total nitrogen , fresh weight, dry weight and leaf size. An increased activity of nitrate reductase was observed upto 13 days of seedling growth.maximum activity was found in leaves whereas stem exhibited no significant effect of nitrate concentration on enzyme level at different stages of growth . an appreciable increase in total nitrogen by exogenous supply of nitrate was also encounterd where as in nitrogen starved seedlings it declined after 13 days .fresh and dry weight of seedlings were less affected with increasing concentration of nitrate . leaf size increased when seedlings were

Effect of potassium naphthenate on rice (oryza sativa L)
ABSTRACT:
Effect of seed soaking and foliar sprays of 0.1, 0.01 and 0.001% potassium naphthenate (K-Nap) solutions on rice oryza sativa L., cv IRRI-6 was investigated . soaking of seeds in each of the solution significantly (p< 0.05) increased the number the number of productive tillers per pot but it did not materially affect the grain weight . K-Nap spray of 0.001% , in addition to seed soaking , further increased the straw weight but grain weight and number of grains per fertile tiller decreased.

Allelopathic effects of datura innoxia mill
ABSTRACT:
Relatively bare areas are frequently present under and around datura innoxia mill thickets, although several herbaceous species may grow well under other adjacent plants causing a shade equal to that of datura. Field and laboratory experiments revealed that datura significantly inhibited germination and growth of test species by root exudates . aqueous extracts from various parts . leachates and substances volatilizing from its shoot. Soil coolected under and around datura was inhibitory against the test species . the phytotoxicity depended upon the part assayed ,

A comparative study of the statistical behaviour of diversity and equitability indices with references to desert vegetation
ABSTRACT:

Studies on Libyan grasses . V. population variability and distribution of schismus arabicus and S. barbatus in libya
ABSTRACT:
Populations of schismus arabicus and S. barbatus from different locations of Libya were collected and their morphology , cytology and reproductive behaviour were studied . the two species show a distinct morphological break between alloparic populations. Under sympatric conditions only S. barbatus and the tentative hybrids occur. This indicates that although S.arabicus did occur in this area in the past, now because of hybridization it has either disappeared or it has become very rare. Although both the species are self0breeders , but there must be frequent breakdown in autogamy. Chromosomal pairing and fertility of the tentative natural hybrids was normal.

Cytogenetic studies
ABSTRACT:
Four varieties (Awn) selected , Ex-

Studies on the organization of genes controlling lysine biosynthesis in neurospora crassa III. Studies on the organization of loci lysine-3 and lysine-4
ABSTRACT:
Studies on the organization of loci lys-3 and lys-4 with the help of 24 mutants for lys-3 and 19 mutants for lys-4 , have shown that interallelic complementation is exhibited in both cases. Both are, therefore, organizationally complex but the complexity is minimal as both the loci seem to comprise just two

Relation of sclerotial inoculum density and soil moisture to infection of field crops by macrophomina phaseolina
ABSTRACT:
The effect of sclerotial density of v at various soil moisture levels on disease incidence in black gram, guar, okra and cotton was investigated. Infection percentage increased linearly with the increase in inoculum density of sclerotia in soil but varied inversely in relation to soil moisture regime. Infection percentage was consistently higher at 30 days compared to that at 15 days of experimental period. The susceptibility to Macrophomina infection varied in the test species. Whereas a scelrotial density of 5/g of soil gave 50% infection in black gram, 20 sclerotia/g of soil were required for okra , guar and 40 for cotton at 25% water holding capacity (W.H.C) Inoculum density of up to 40 sclerotia /g soil coupled with high soil moisture (100% W.H.C) did not produce more than 50% infection.