Issue 01

Effect of cow and poultry manures as basal fertilizers on marketable fruit yield of okra (abelmoschus esculentus l)

Fri, 21 Sep 2012 00:00:00 GMT

Effect of cow and poultry manures as basal fertilizers on marketable fruit yield of okra (abelmoschus esculentus l) Viharnaa, S.; Thayamini, H.S. An experiment was conducted to study the influence of cow and poultry manures on the marketable yield of okra (Abelmoschus esculentus L) on sandy regosol. The treatments included basal applications of inorganic fertilizer (control) and combined use (10t/ha) of cow plus poultry manures (CM: PM) at ratios of 5:0, 4:1, 3:2, 2:3, 1:4 and 0:5. Significantly higher (P<0.05) marketable yield (13t/ha) was recorded in plots treated with CM: PM at 3:2 ra tio as compared to the control (9t/ha).,

Effect of sulphur dioxide on growth, chlorophylland sulphur contents of pomegranate

Tue, 08 Jan 2013 00:00:00 GMT

Effect of sulphur dioxide on growth, chlorophylland sulphur contents of pomegranate Swain, S.C.; Padhi, S.K. The direct toxic effect of atmospheric pollutant such as sulphur dioxide on plants has been well documented. It is essentially a potent phytotoxic gas and its toxicity to plant is manifested in typical chronic or acute foliar symptom injury. The mode and extent of damage caused by this pollutant to pomegranate has not been precisely and sys tematically studied. Under such circumstances, the present investigation was undertaken under simulating condi tion to find out the possible extent of adaptability of pomegranate in SO2 emission of our state. The effect of vary ing levels of sulphur dioxide (0.25, 0.5 and 1.0ppm) fumigated for 1, 2 and 3h under simulated conditions on pomegranate revealed that the important traits like leaf number, leaf area, fresh weight, dry weight and chlorophyll content in leaves were adversely affected by SO2 level. SO2 1.0ppm with 3h exposure found to be more harmful. However, no significant variation was seen amongst the treatments in respect of tissue fresh and dry weight when compared with that of control (ambient SO2). On the other hand, sulphur content in tissues increase pro gressively with increasing levels of SO2 and time of fumigation and the variation observed within treatments was significant to each other. It is suggested that the lowest concentration of SO2 (0.25 ppm) used in this study is more than sufficient to bring about a significant changes in most of the parameters studied.

In vitro induction of octaploid from colchicine-treated tetraploid petiole explants of purple coneflower (echinacea purpurea l.)

Tue, 09 Apr 2013 00:00:00 GMT

In vitro induction of octaploid from colchicine-treated tetraploid petiole explants of purple coneflower (echinacea purpurea l.) Dahanayake, N.; Yue-Sheng Yang Petiole explants were obtained from in vitro grown tetraploid (2 x = 44) Echinacea purpurea plantlets. Shoots were regenerated by culturing the explants on MS basal medium containing 0.5mg/L benzyladenine (BA), 0.01mg/L naphthaleneacetic acid (NAA) and four concentrations (30, 60, 120, and 240mg/L) of colchicine for 30 days, or 120mg/L of colchicine for 7, 14, 21 and 28 days. The regenerated shoots were induced to root on MS basal medium with 0.01 mg/L NAA, and then the root-tips of the regenerated shoots were sampled for count of chromosome number. It was found that a treatment duration of >7 days was necessary for induction of octaploids (8 x = 88) shoots, and treatment with 120mg/L colchicine for 28 days was the most efficient for the induction of octaploids, yielding 10% of octaploids among all the regenerated shoots. Chimeras were observed in almost all the treat ments. However, the ratio of octaploid to tetraploid cells in a chimeric plant was usually low. In comparison with tetraploid plants, octaploid plants in vitro had larger stomata and thicker roots and had prominently stunt plant with very short life cycle. Octaploid E. purpurea plantlets can’t survival in the natural environment.

Effect of sulphur dioxide on growth, chlorophylland sulphur contents of pomegranate

Tue, 08 Jan 2013 00:00:00 GMT

Effect of sulphur dioxide on growth, chlorophylland sulphur contents of pomegranate Swain, S.C.; Padhi, S.K. The direct toxic effect of atmospheric pollutant such as sulphur dioxide on plants has been well documented. It is essentially a potent phytotoxic gas and its toxicity to plant is manifested in typical chronic or acute foliar symptom injury. The mode and extent of damage caused by this pollutant to pomegranate has not been precisely and systematically studied. Under such circumstances, the present investigation was undertaken under simulating condition to find out the possible extent of adaptability of pomegranate in SO2 emission of our state. The effect of varying levels of sulphur dioxide (0.25, 0.5 and 1.0ppm) fumigated for 1, 2 and 3h under simulated conditions on pomegranate revealed that the important traits like leaf number, leaf area, fresh weight, dry weight and chlorophyll content in leaves were adversely affected by SO2 level. SO2 1.0ppm with 3h exposure found to be more harmful. However, no significant variation was seen amongst the treatments in respect of tissue fresh and dry weight when compared with that of control (ambient SO2). On the other hand, sulphur content in tissues increase progressively with increasing levels of SO2 and time of fumigation and the variation observed within treatments was significant to each other. It is suggested that the lowest concentration of SO2 (0.25 ppm) used in this study is more than sufficient to bring about a significant changes in most of the parameters studied.