Effect Of Paclobutrazol

Effect of paclobutrazol application on the phenophase of banana cv. Martaman
I. Murmu1, S. Diengngan2*, M.A Hasan3,
Department of Fruits and Orchard Management, Bidhan Chandra Krishiviswavidyalaya, Mohanpur, Nadia, West Bengal – 741252
*Corresponding author
Abstract
The study was undertaken to study the effect of paclobutrazol on the crop duration of banana cv. Martaman (AAB). The experiment consisted of 12 (twelve) treatments viz. Foliar application of paclobutrazol at 0.50 ml/l, 1.00 ml/l, 1.50 ml/l and 2.00 ml/l of water and Soil application at 0.25 ml/m, 0.50 ml/m, 0.75 ml/m, 1.00 ml/m, 1.25 ml/m, 1.50 ml/m, 2.00 ml/m of canopy radius and Control. Observations recorded revealed that application of paclobutrazol significantly influenced
Sword suckers of uniform size were pared before planting and the corms of the suckers were treated with monocrotophos at 0.1% and carbendazim at 0.1% for 30 min. Planting were done in pre-prepared pits. The pH of the soil is nearly 6-6.8 with good drainage facilities. Each plant was supplied with 300g N, 50g P2O5, and 400g K2O in the form of urea, single super phosphate and murate of potash. The experiment consisted of 4 (four) replication and 12 (twelve) treatments viz. T1- Foliar application of paclobutrazol at 0.50 ml/l of water, T2- Foliar application of paclobutrazol at 1.00 ml/l of water, T3- Foliar application of paclobutrazol at 1.50 ml/l of water, T4- Foliar application of paclobutrazol at 2.00 ml/l of water, T5- Soil application of paclobutrazol at 0.25 ml/m of canopy radius, T6- Soil application of paclobutrazol at 0.50 ml/m of canopy radius, T7- Soil application of paclobutrazol at 0.75 ml/m of canopy radius, T8- Soil application of paclobutrazol at 1.00 ml/m of canopy radius, T9- Soil application of paclobutrazol at 1.25 ml/m of canopy radius, T10- Soil application of paclobutrazol at 1.50 ml/m of canopy radius, T11- Soil application of paclobutrazol at 2.00 ml/m of canopy radius, T12- Control (without application of paclobutrazol). Various observations on planting-shooting
Martaman were evaluated and presented hereunder. Crop cycle was significantly reduced with the application of paclobutrazol of irrespective of doses and mode of application. However, the soil application of paclobutrazol was more effective in reducing crop cycle than foliar application. The minimum planting-harvest interval was recorded with soil applied paclobutrazol at 0.25ml/m of canopy radius which was at par with 0.50ml/m of canopy radius. Crop cycle was least influenced with paclobutrazol as foliar spray (Table 1). Maia et al. (2008) reported that paclobutrazol did not affect the planting-shooting interval. The days required from planting to shooting was prolonged with paclobutrazol application as foliar spray. However, soil application of paclobutrazol shortened the planting-shooting interval at 0.25ml/m and 2.00ml/ meter of canopy radius (Table 6). With respect to shooting to harvest interval, foliar application of paclobutrazol at 0.50 ml/l of water results in the lowest shooting to harvest interval which was at par with 2.00 ml/l of water foliar application. Harvest index was found to be highest in the soil application of paclobutrazol at 0.75ml/m and 1.25ml/m of canopy radius. The highest cost:benefit ratio was found with soil applied paclobutrazol at 0.75ml/m of canopy radius. (Table 1). Thus, the soil application of paclobutrazol was more effective in reducing crop cycle than foliar