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    ThesisItemOpen Access
    EFFECT OF SOWING DATES ON GROWTH, YIELD AND QUALITY OF CERTAIN CARROT (Daucus carota Linn.) CULTIVARS
    (ANDHRA PRADESH HORTICULTURAL UNIVERSITY, 2011-06) MADHAVI LATHA POLAKI; Dr.P. SYAM SUNDAR REDDY
    The present investigation entitled “Effect of sowing dates on growth, yield and quality of certain carrot (Daucus carota Linn.) cultivars” was carried out during rabi of 2010-2011 at College of Horticulture, Venkataramannagudem, West Godavari District of Andhra Pradesh. The study was carried out with four different sowing dates viz., November 10th, November 25th, December 10th and December 25th and three cultivars namely Pusa Kesar, Pusa Rudhira and Kuroda Improved. The experiment was laid out in a split plot design with three replications and the data on effect of different dates of sowing and different varieties on growth, yield, yield attributes and quality attributes were recorded and statistically analyzed. Sowing time has shown significant effect on the growth parameters like plant height, number of primary and secondary branches. Highest plant height and maximum number of primary branches and secondary branches were produced by plants which were sown early i.e., on November 10th. Similarly, various yield attributes viz. fresh weight of the plant, fresh and dry weight of the root, root length, root diameter, root shoot ratio and core thickness; yield per plot and yield per hectare were highest from November 10th sowing. In the experiment, November 10th sowing gave the highest yields of 172.82 q ha-1 compared to the lowest yield of 67.98 q ha-1 by December 25th sowing. Moisture percentage, TSS, reducing and total sugars were also significantly affected by sowing dates. Sowing carrot at 10th November recorded the highest values of each of the above mention parameters. All the parameters viz., growth, yield, yield attributes and quality showed decreasing trend as sowing date was delayed. Results also revealed that all the growth parameters, yield and yield attributes and quality parameters also significantly affected by different varieties. Growth parameters such as plant height, number of primary and secondary branches were maximum with Kuroda Improved variety irrespective of dates of sowing. Similarly, the root yield and yield contributing characters were also found to be maximum with Kuroda Improved variety. Highest yield (149.16 q ha-1) was obtained with the Kuroda Improved variety, followed by Pusa Rudhira (121.39 q ha-1), and the lowest (111.49 q ha-1) was with Pusa Kesar. Whereas Pusa Rudhira was found to be the best in respect of quality judged. In the same concern, the interaction between sowing dates and varieties also showed significant effect in case of plant height, yield attributes, yield and TSS. Combined effect of sowing dates and varieties showed that early sowing on November 10th, all cultivars performed well with respect to yield and yield components. However, among all the treatmental combinations Kuroda Improved variety sown on 10th November recorded the best in respect of yield and yield components, whereas Pusa Rudhira was found to be the best with respect to quality judged which was sown on the same date i.e., 10th November. Interaction between the two factors under investigation did not show any effect on the growth parameters like germination percentage, number of primary and secondary branches and quality attributes viz., moisture percentage, total sugars and reducing sugars.