This study was aimed to evaluate the effect of paired row planting of radish (Raphanus sativus L.) intercropped with vegetable amaranthus (Amaranthus tricolor L.
An experiment was carried out to find suitable ratio of inorganic fertilizer and compost, which could give an economic yield of onion (cv. Jaffna Local). This experiment was designed in a Randomized Complete Block Design with four replicates. Treatments were recommended dosage of inorganic fertilizers as a control (T 1), ¾ fold of the control treatment + compost (2 t ha-1) (T 2), ½ fold of the control treatment + compost (4 t ha-1) (T 3), ¼ fold of the control treatment + compost (6 t ha-1) (T 4) and the compost alone (8 t ha-1) (T 5). These were applied as basal application of fertilizer in this experiment. The results of this study revealed that there were significant (P<0.05) differences in the numbers of leaves and roots between the different treatments during the early stage of growth. Relatively higher yield (5.03 t ha-1) was obtained from the plants treated with inorganic fertilizers alone (T 1), whereas compost alone (T 5) produced the lowest yield (3.43 t ha-1). It was also noted that there were no significant (P>0.05) differences in the yields between T 1 and T 2 as well as T 1 and T 3. The inorganic fertilizers appear to have compensated with slow release of nutrients from the compost and their combined effects would have increased the yield. From this study, it could be stated that half fold of the inorganic fertilizer and compost at the rate of 4 t ha-1 (T 3) could give profitable yield (4.75 t ha-1) and this combination could possibly reduce the cost of production in the cultivation of onion.
A field experiment was conducted at the Agronomy farm, Eastern University, Sri Lanka to study the biological and economic efficiency of radish (Raphanus sativus L.) intercropped with vegetable amaranthus (Amaranthus tricolor L.). Treatments were radish as sole crop (T1), vegetable amaranthus as sole crop (T2), 20/50 cm paired row radish with three (T3) or four (T4) rows of vegetable amaranthus in between paired rows and 25/40 cm paired row radish with three (T5) or two (T6) rows of vegetable amaranthus in between paired rows. The results showed that, there was no significant difference (P>0.05) in area time equivalency ratio (ATER) among intercropping treatments and significant differences (P<0.05) were obtained in the land equivalent ratio (LER) and crop performance ratio (CPR). LER (1.31) and CPR (1.71) were superior in T3 and T4 respectively. In case of economic indices, gross return was significantly differed (P<0.01) among treatments. It was high in T3 followed by T4. Intercropping system recorded significantly high (P<0.01) cost of cultivation over intercropping system. Among intercropping, T4 resulted maximum net return, monetary equivalent ratio, cost benefit ratio and per day return over other intercropping treatments and sole crops. This experiment revealed that T4 would be the most efficient system in both biological and economical point of view.
Ginger (Zingiber officinale Rosc.) is a perennial herb. It belongs to the family Zingiberaceae and commercially cultivated in most tropical regions of the world. The underground rhizomes are the planting materials in a conventional propagation of ginger however it has a low multiplication rate. It is known that there are possible methods are available for rapid vegetative propagation of ginger through direct organogenesis or somatic embryogenesis under in vitro conditions but it is necessary to find the best protocol for in vitro multiplication of ginger. Limited studies on the tissue culture technology of ginger are available in Sri Lanka. However, significant efforts have been made in the procedure for in vitro micropropagation in the other ginger growing countries. The available literature with respect to in vitro plant regeneration has been perused and this review mainly focused on the in vitro propagation via direct organogenesis from rhizome buds or shoot tips of ginger often used as explants. This review article may be an appropriate and effective guidance for establishing in vitro cultures and subsequent production of in vitro plantlets in clonal propagation of ginger.
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