In eastern India, the majority of areas under rainfed ecosystem are left fallow after kharif rice mainly due to lack of availability of irrigation water. Under this situation, pineapple is a suitable crop due to its adaptation system of crassulacean acid metabolism for photosynthetic carbon fixation. Pineapple is a long-duration crop (16–18 months) with irregular flowering behaviour. Hence, the present study was undertaken to study the feasibility of growing pineapple crop after harvest of kharif rice in a yearly sequence at the Research Farm of ICAR-Indian Institute of Water Management, Mendhasal, Khurda (Odisha), for two consecutive years (2009–2010 and 2010–2011). Ethephon hormone was applied at 10-month stage of crop to induce uniform and early flowering. In addition to this general treatment, spray of planofix at 50 mg l⁻¹ (after 15 days of ethephon application at 20 mg l⁻¹) resulted in the maximum flowering (81.2%). Similarly, 79.9% flowering was recorded when the plants were grown under shade. Also, spray of planofix resulted in the highest fruit yield (16.9 t ha⁻¹) of pineapple due to increased fruit size. Fruit quality in terms of total soluble solids (14.85%) and vitamin C (150.18 mg kg⁻¹) content was improved, and fruit acidity (0.58%) was decreased with spray of planofix. Therefore, pineapple can be grown in rice-based cropping system after harvest of kharif rice with suitable hormonal treatment, which will bring down the duration of pineapple crop to about 14 months (8 months in nursery and 6 months in main field).

中文翻译：

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在印度东部的种植顺序中，将菠萝（Ananas comosus L.）与雨养稻米配合使用

在印度东部，海里发水稻后，大部分处于雨育生态系统的地区都处于休耕状态，这主要是由于缺乏灌溉水。在这种情况下，菠萝是适合的农作物，因为它具有适应性的克拉苏糖酸代谢系统，可以固定光合作用的碳。菠萝是一种长时期的作物（16-18个月），开花行为不规则。因此，本研究旨在研究收获哈里夫后种植菠萝作物的可行性。连续两年（2009–2010年和2010–2011年）在库尔达（奥里萨邦，门达萨尔）的ICAR印度水资源管理研究所的研究农场每年一次。在作物的10个月阶段施用乙烯利激素，以诱导均匀和早开花。除此一般处理外，以50 mg l ^-1喷洒Planofix （在施加20 mg l ^-1的乙烯利15天后）可达到最大开花（81.2％）。类似地，当植物在阴凉处生长时，记录的开花率为79.9％。此外，由于果实尺寸的增加，使用Planofix喷雾可以使菠萝的果实产量最高（16.9 t ha ^-1）。总可溶性固形物（14.85％）和维生素C（150.18 mg kg ^-1）的水果品质）的含量提高了，而喷洒了平果固定剂则降低了水果酸度（0.58％）。因此，在收获了卡里夫大米之后，可以通过适当的激素处理在基于水稻的种植系统中种植菠萝，这将使菠萝的种植时间缩短至大约14个月（苗圃为8个月，主田为6个月）。