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Effect of Boron for Correcting the Deformed Shape and Size of Jackfruit

N. K. HALDER
Horticulture Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh

A. T. M. FARID
Soil Science Division, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh

M. A. SIDDIKY
Soil Science Division, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

A field study on jackfruit (cv. local) was conducted at Brown Hill Soils (Eutrochrepts) of South Eastern Hilly regions (AEZ/29) under Hill Tracts Agricultural Research Station, Ramgarh, Khagrachri during the years of 2002-2003 and 2003-2004. The objective was to reduce the number of deformed fruits through boron fertilization and to obtain increased number of normal fruits/tree. Four levels of boron (0, 5, 10 and 15 g tree-1) and three age groups (10, 15 and 20 years) of jackfruit trees were considered in the study. The effect of boron application on plant of different age groups was found highly significant on flower and fruit characters of jackfruit. However, the highest level of boron applied (15 g tree-1) to the highest age group of plants (20 years) produced significant number of normal fruits (78 and 140 tree-1) and reduced the number of deformed fruits per tree in two consecutive cropping years 2002-2003 and 2003-2004, respectively. The highest mean normal fruits (111/tree) and lowest percent of deformed fruits (24%) were recorded due to application of highest level of B (15 g tree-1). The significant increasing in female flowers and male to female ratio contributed towards the increased number of normal fruits having more fruit weight and normal size.

Keywords: Jackfruit, Boron, Fertilization, Deformed fruits.

Location: Agricultural Research Station, Ramgarh, Kharachari

Start Date: 00-07-2002

End Date: 00-06-2004

Program Area: Crop-Soil-Water Management

Commodity: Jackfruit, Fertilizer

Objectives:

To find out the optimum dose of boron for correcting the deformed shape and size of jackfruit.

Methodology:

The experiment was conducted at Agricultural Research Station, Ramgarh, Kharachari during the periods of July to June of 2002-2003 and 2003-2004. The experimental soil was sandy clay loam. The analyzed soil of the experimental site is sandy clay loom and the pH indicates the soil is strongly acidic in nature. The fertility status of the soil is very poor as the organic matter content and other nutrient elements were found to be below the critical level. The experiment was designed in randomized block with three replications. The plot dimension and spacing were adjusted in the established orchard of the station. The trees were mainly selected near the top of the hill nearing 40m above the sea level. Local cultivars of jackfruit were selected as test crop. Each and every tree was considered as a treatment under the replications. There were four levels of boron viz. 0,5,10, and 15 g tree-1 and three age group of 10, 15 and 20 years were considered in the study. The combined blanket dose @ 920g N: 200g P: 250g K: 85g S:20 tree-1 and 10 kg cowdung were used in the experiment. Thirty six plants of twelve (12) from every group were randomly selected for the study. After harvesting of fruits light pruning was done in selected trees prior to fertilization. Fertilizer application was done to the soil of the orchard in two equal splits in last week of July and mid November by ring placement method. Intercultural operations were also performed in time. Data on time of flower initiation, number of female spikes, number of male spikes and number of fruit set per plant were recorded in time. Ripe jackfruits were harvested from April to June 2003 and 2004, respectively. Ten fruits of different size and shape were randomly selected from every treatment for data collection. All the necessary data on different parameters were compiled for statistical analysis and adjudged with least significant difference (LSD) at 5% level of significance.

Source of Information: J Agric Rural Dev 6(1&2), 37-42, June 2008 ISSN 1810-1860

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From two years study, it is evident that boron and age of trees exerted an encouraging effect on fruit characters of jackfruit. However, it can be summarized from this findings that 20 years trees with 15 g B tree-1 along with the blanket dose of N-P-K-S-Zn and CD @ 920:200:250:85:20 g/tree and 10 kg cowdung was optimum for increasing normal number of fruits and lowering the number of deformed fruits per tree. Considering the nutritional importance and epoch-making change in correcting the deformation of jackfruit, 15 g B tree-1 for 20 years old trees along with the said blanket dose of fertilizers may be prescribed for boosting the jackfruit production in hill tract region of Bangladesh.

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