National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
In three propagative planting materials; stems shoots, slips and crowns, planted and grown in 20 L pots, the fresh pineapple (Ananas comosus MD-2) biomass was determined at harvest of the plant crop. Considering the main plant organs of the shoot system differences in weight of leaves (P< 0.0001), fruit (P< 0.0001) and stem (P< 0.0001) were found among planting materials. Plants coming from crowns showed lower weight of the three variables, differing from plants originating from slips and stem shoots, which were similar. Leaves weight varied between 2480.0 and 3527.5 g, fruit weight between 1264.0 and 1995.0 g, and stem weight between 553.0 and 868.5 g. Plant root weight that oscillated between 374.5 and 487.5 g was similar (P= 0.0914) among the three planting materials. For the stem shoots, a significant positive linear correlation was found between fruit and leaves weight (r = 0.50; P= 0.0238) and between root and leaves weight (r= 0.76; P< 0.0001). Also, a positive linear correlation for the crown plants was found between leaf and fruit weight (r= 0.56; P= 0.0096) as well as between root and leaves weight (r = 0.74; P= 0.0001). The plant organs-fractions contribution to the complete fresh plant biomass at harvest in descending order was: leaves between 2480.0 and 3527.5 g (between 49.4 and 50.1%), fruit between 1264.0 and 1995.0 g (between 25.6 and 28.8%), stem between 553.0 and 868.5 g (between 11.0 and 12.2%), roots between 374.5 and 487.5 g (5.2 and 8.1%), crown between 211.3 and 237.3 g (between 3.0 and 4.9%) and the slips between 11.3 and 94.0 g (between 0.2 and 1.2%). From the main plant organs-fractions (leaves, stem, fruit, roots), roots represent the smallest proportion but are responsible for anchorage, water and nutrients supply, and exchange of various growth substances with the shoots. This emphasizes the necessity to potentialize the maximum genetic expression of the root system of the planting material as well as maintaining its health and conservation. It is known that the pineapple root growth decreases after flower induction, with the maximum root mass reached at anthesis. On the other hand, pineapples roots do not regenerate or produce again if damaged or attacked by pests and diseases, and for those who run the plantation for one or two ratoon crops, it is essential to understand this fact, since their yield depends on the original root system developed during the plant crop.
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