Stages of vine pruning for vine production of bottle gourd varieties and lines in summer season

Four bottle gourd varieties and lines (V1: BARI Lau-3, V2: BARI Lau-4, V3: LS 0012-5-3 and V4: LS 0026-5-3) and three pruning stages (P1: Pruning at two vine stage, P2: Pruning at 3 vine stage and P3: Pruning at 4 vine stage) were implied to observe the effect of pruning on the maximization of vine production in bottle gourd. V4 produced maximum number of vine (117.2/plant) and highest vine yield (10.2 t/ha) among four varieties while P3 produced maximum number of vine (109.2/plant) and highest vine yield (9.1 t/ha) among three pruning techniques. The maximum number of harvested vine (118.0/plant) and highest vine yield (10.73 t/ha) was found from V4P3 which was statistically followed by V4P1 and the lowest vine yield was recorded from V2P1 (6.62 t/ha). LS 0026-5-3 along with pruning of terminal shoots four vine stages can be recommended for better vine production in bottle gourd for use as leafy vegetable.


I. Introduction
Bottle gourd (Lagenaria siceraria) is a commonly cultivated summer seasonal vegetable in Bangladesh belongs to Cucurbitaceae family.Beside fruit production the tender leaves and vines of bottle gourd are also used as a very delicious and highly nutritious vegetable in Bangladesh.Growth and yield performance varied due to the genotypic variation thus facilitate the great opportunity to select the better genotype (Jamal Uddin et al., 2014;Rajesh et al., 1999;Ram et al., 2005) of bottle gourd (Koffi, 2009).Pruning can modify plant growth according to desired levels (Jarrick, 1986).Vine pruning has generally been done for many purposes (Humphries and Vermillion, 1994) more specifically increases the branching of plants.Our current target is to produce more vine of bottle gourd.As bottle gourd tender leaves and vine used as vegetable, so vine pruning may help to increase the production of more leaves and vines by increasing the number of branches

II. Materials and Methods
The experiment was carried out at the research field of Olericulture Division, Horticulture Research Center, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur, Dhaka, Bangladesh during summer season of 2014.The experiment consisted two factors, i.e., four bottle gourd varieties and lines (V1: BARI Lau-3, V2: BARI Lau-4,V3: LS 0012-5-3 and V4: LS 0026-5-3) and three stages of pruning (P1: Pruning at two vine stage, P2: Pruning at 3 vine stage and P3: Pruning at 4 vine stage).Each vine contained main branch during pruning.The seeds of four bottle gourd varieties were sown in poly bags on 10 th May 2014 and the seedlings were transplanted in the main field on 5 th June 2014.The experiment was laid out in randomized complete block design with three replications.The unit plot size was 10.0 x 2.5 m maintaining 2.0 x 2.5 m spacing.The land was fertilized with cow dung, N, P, K, S and Zn @ 20000, 175, 175, 150, 100 and 12 kg/ha, respectively.The total amount of cow dung, P, S and Zn and 1/3 rd of each of N and K were applied during final land preparation and in the pit.The rest of N and K were applied in four equal installments at 21, 35, 55 and 75 days after transplanting.The intercultural operations were done as and when needed.Pruning started after first female flower opening and no fruit was allowed in whole experiment.Data were recorded from three randomly selected plants per treatment per replication on number of vines/plant, weight of vine/plant (kg), vine length (cm), vine diameter (cm), leaf area (cm 2 ), internodes length (cm) and vine yield (t/ha).The collected data on different characters were statistically analyzed using MSTAT-C computer package program and mean differences were determined by Duncan's Multiple Range Test (DMRT) at 5% level of probability (Gomez and Gomez, 1984).

Effect of pruning on vine production in bottle gourd
The main effect of pruning on vine production in bottle gourd is presented in found in P1 (8.3 t/ha).Our study showed the significantly different results for studied parameters at different stages of vine pruning.Positive and significant correlation was present between leaf area of vine and weight of bunches in vine (Senthilkumar et al., 2015) i.e., pruning increase the leaf area but severity of pruning decrease the leaf area while pruning severity increased internodal distance (Brandon et al., 2012).

Combined effect of variety and pruning on vine production in bottle gourd
Significant variations were found in the combined effect of variety and pruning in the vine production in bottle gourd (Table 03).The maximum number of harvested vine per plant (118) was resulted in LS 0026-5-3 along with four vine pruning stage (V4P3).The highest vine yield (10.7 t/ha) was recorded from the line LS 0026-5-3 when the vines were pruned at four side vine stage (V4P3) which was statistically followed by the same line when the vines were pruned two side vine stage (V4P1) and the lowest vine yield was recorded from the BARI Lau-4 (6.6 t/ha) when it was pruned at two side branch stage (V2P1).Here, V1 = BARI Lau-3, V2= BARI Lau-4, V3= LS 12-5-3 andV4= LS 26-5-3; P1: Pruning at two vine stage, P2: Pruning at three vine stage, P3: Pruning at four vine stage

IV. Conclusion
LS 0026-5-3 along with pruning of terminal shoots four vine stages can be recommended for better vine production in bottle gourd for use as leafy vegetable.The present investigation is going on also in summer 2014-15.Again the experiment will be repeated with other varieties and lines for detail study in the next year in both the winter and summer seasons.
Research paper conducted to develop the vine pruning stages in maximizing vine production of bottle gourd for use as leafy vegetable.

Table 02
. The variation was observed among the different pruning in vine production in bottle gourd.The highest number of harvested vine was recorded in P3 (109.2/plant)followed by P2 (109.0/plant) and lowest in P3 (108.8/plant).The internodes length was maximum in P1 (14.3 cm) and minimum in P2 (14.0 cm).The highest vine yield was recorded in P3 (9.1 t/ha) followed byP2 (8.5t/ha) and the lowest yield was Published with open access at journalbinet.comEISSN: 2312-7945, © Ali et al. (2016), Research paper