Response of onion variety Phulkara in terms of growth and bulb production to various NP fertilizer doses

Present experiment was conducted to assess the response of onion variety Phulkara in terms of growth and bulb production, to various NP fertilizer dozes at Sindh Agriculture University, Tandojam during 1998-99.1 The observations were recorded on different growth and yield Contributing parameters viz., plant height, number of leaves per plant, horizontal and vertical bulb diameter, single bulb weight, bulb yield per plot and per hectare. The experiment was comprised of six NP fertilizer levels including a control. After transplanting of the seedlings the observations were recorded on various growth and yield parameters. The growth parameters were measured at various growth stages, while the yield attributes were measured after harvest of the onion detailed observations, the data were statistically analyzed, and the results were discussed in the chapter of results and discussion. The NP level of 100-75 kg per hectare produced significantly greater plant height (39.33 cm), followed by plant height of 35.67 cm and 32.67 cm observed under NP levels of 185-65 kg and 70-55 kg per hectare respectively. While the minimum plant height (18.00 cm) was recorded under control, statistically the differences were highly significant. Statistically the differences were highly significant for this component. While results illustrate that the NP levels of 100-75 kg and 85-65 kg per hectare produced significantly greater number of leaves (9.53 and 9.38) followed by 8.45 and 1.48 leaves per plant recorded under 70-55 and 55-45 kg, NP per hectare respectively. Whereas, the minimum number of leaves (5,33) per plant was observed in case of control. The results revealed that higher NP levels of 100-15 kg and 85-65 kg per hectare recorded significantly higher horizontal diameter of onion bulb (8.25 cm and 7.98 cm), followed by 7.33 cm and 6.73 cm horizontal bulb diameter noted under the plots supplied with 70-55 and 55-45 kg NP per hectare respectively. However, the minimum horizontal bulb diameter (4.0 cm) was recorded under control. Statistically the differences were highly significant. The plots treated with NP levels of 100-75 kg, and 85-65 kg per hectare recorded significantly great Vertical diameter of onion bulb (6.39 cm and 6.33 cm), followed by 5.86 cm and 5.47 cm vertical bulb diameter not ad under the plots supplied with 70-55 and 55-45 kg NP per hectare, respectively. However, the minimum vertical bulb diameter (4.13 cm) was recorded under control. Statistically the differences were highly significant. The maximum single bulb weight -of onion (92.3-1 9) was produced under highest NP level of 100-75 kg per closely followed by 85-65 kg NP level having single bulb weight of 90 g, while NP levels 70-55 kg and 55 .15 kg per hectare ranked third and fourth giving single bulb weight of 79.33 g and 68.67 g in descending order. The minimum single bulb weight of 32.67 g was recorded in base of control. The higher NP levels of 100 -75 and 85-65 Kg per hectare resulted in significantly greater bulb yield (39.571 and 38.571 m.t.) per hectare, followed by 70-55 kg NP per hectare, which recorded -bulb yield of 34.00 m.t. per hectare. The minimum bulb yield per plot (14.70 kg) was recorded in case of control Higher NP levels of 100-75 and 85-65 kg per hectare resulted in significantly greater bulb yield (39.571 and 38.571 m.t) per hectare, followed by 70-55 kg NP per, hectare, which recorded bulb yield of 34.00 m. t per hectare. The minimum bulb yield per hectare (14.00 m.t) was recorded in case of control plots where no fertilizer was applied.