Recalcitrant seeds loose viability on drying or their exposure to chilling temperature and are difficult to store for longer periods. An assured supply of seeds for grafting as a rootstock during the lean period can be achieved only from the seed stock held in storage. Jackfruit (Artocarpus heterophyllus Lam.) seeds are recalcitrant in nature and lose viability during storage. Hence, an investigation on seed viability of jackfruit and methods to prolong it under artificial storage conditions was conducted. The experiment was conducted with eight seed storage methods and six storage periods with two replications in factorial randomized block design. A hundred seeds per treatment per replication was the unit. It was revealed that the loss in moisture content of the seed was negatively associated with the germination percentage, days to first germination, days required for 50 per-cent germination, germination period, germination index, germination value, seed vigor, seedling vigor index and the height of the seedling from such germinated seed was seriously hampered.
<p>High yielding hybrids can play an important role in increasing the productivity of oil in the oil palm. With a view to evaluate high yielding new oil palm cross combinations, a field experiment was conducted in different agro-climatic regions of India <em>viz</em>., Zone No-10 Southern Plateau and Hills (Gangavathi, Karnataka), Zone No-12 Western Coastal Plains and Ghats (Mulde, Maharashtra) and Zone No-11 Eastern Coastal Plains and Hills (Vijayarai, Andhra Pradesh) involving ten cross combinations of tenera oil palm (NRCOP 1-10). The data from three locations over two years indicated that, significantly higher annual rate of leaf production per palm was recorded in NRCOP-6 (21.7) compared to NRCOP-3 and it was on par with other hybrid combinations. Significantly higher sex ratio was recorded with NRCOP-4 (63.1%) compared to NRCOP-1 (54.6%) and NRCOP-6 (54.8%) and was on par with other hybrid combinations.The hybrid cross combination, NRCOP-4 recorded significantly higher fresh fruit bunches (FFBs) yield 12.5 t ha-1 compared to NRCOP-1, NRCOP-3, NRCOP-7 and NRCOP-9 and it was on par with remaining hybrids and a similar result in bunch weight and number of bunches per palm was recorded. Pooled data on FFB yield for 2013-15 indicated that the hybrid combination NRCOP-4 which recorded higher FFB yield (12.6 t ha-1) at Gangavathi and at Vijayarai (22.6 t ha-1) have better prospects for adaptation under Tungabhadra command area and coastal region of Andhra Pradesh. For Konkan region of Maharashtra, the hybrid NRCOP-8 recorded the highest FFB yield.</p>
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