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Performance of Carrot as Intercrop in Multistrata Sissoo Woodlot

M.S. Bari
Department of Agroforestry, HMDSTU, Dinajpur

M.A. Rahim
Department of Horticulture, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

The experiment was conducted at the existing multistrata sissoo woodlot of the Horticulture Farm, Bangladesh Agricultural University, Mymensingh, to investigate the performance of carrot as intercrop in sissoo based multistrata Agroforestry system (MAF) and also to observe the effect of different spacing of upper and middle layer trees on carrot yield during the period of October 2005 to March 2007. The experiment was laid out in randomized complete block design with three replications. There were seven treatments in this experiment viz. T₁= sissoo (spacing 4m x 4m) + guava (spacing 2m x 2m) + carrot; T₂= sissoo ( spacing 4m x 4m) + lemon (spacing 2m x 2m) + carrot; T₃= sissoo (spacing 5m x 5m) + guava (spacing 2.5m x 2.5m) + carrot; T₄= sissoo (spacing 5m x 5m) + lemon (spacing 2.5m x 2.5m) + carrot; T₅= sissoo (spacing 6m x 6m ) + guava ( 3m x 3m )+ carrot; T₆= sissoo (spacing 6m x 6m) + lemon (spacing 3m x 3m ) + carrot and T₇= sole cropping of carrot. From the treatments T₁ to T₆ were three layered woodlot consisted of sissoo at the top layer, guava and lemon at the middle layer; and carrot was at the ground layer and T₇ were in open condition. In the open condition T₇ received 100% sunlight; while sissoo+ guava based Agroforestry system (T₁, T₃ and T₅) and sissoo +lemon based Agroforestry system (T₂, T₄ and T₆) allowed, respectively 33 to 54% and 45 to 69% sunlight for the growth of carrot. The Experimental results revealed that multistrata agroforestry systems with different tree spacing were found to significantly influence on the root yield of carrot. The highest carrot root yield (29.87 t/ha in 2005 and 29.24 t/ha in 2006) was recorded under sole cropping, which was followed by the wider and intermediate spacing of sissoo+lemon based MAF. The reduction in yield of carrot compared to sole cropping was more at closer spacing of multistrata agroforestry systems. Significantly, the lowest yield (17.84 t/ha in 2005 and 18.65 t/ha in 2006) was recorded in narrower spacing of sissoo+guava based MAF. This yield reduction was 40.27 % in 2005 and 36.22 % in 2006 over the sole cropping. But, it was found that the highest benefit-cost ratio of 4.74 was recorded from intermediate spacing of sissoo+guava based MAF followed by T₄, T₅, T₁, T₂ and T₆ treatments. The lowest benefit-cost ratio of 3.48 was observed in sole cropping of carrot.

Keywords: Multistrata, Sissoo, Lemon, Guava, Carrot, Agroforestry system, Woodlot

Location: Horticulture Farm, Bangladesh Agricultural University, Mymensingh

Start Date: 00-10-2005

End Date: 00-03-2007

Program Area: Farming System

Commodity: Sisso, Lemon, Guava, Carrot

Objectives:

1. To evaluate the performance of carrot under sissoo based multistrata agroforestry systems.

Methodology:

The experiment was conducted in the existing multistrata sissoo woodlot of the Department of Horticulture, Bangladesh Agricultural University, Mymensingh throughout the growing seasons of 2005-2007. Geographically it is located about 22.03⁰ North latitudes and 90.26⁰ East longitudes. The experimental area is under sub-tropical climate characterized by heavy rainfall during the months from April to September and scanty rainfall during the rest period of the year. The soil of the experimental area is silty loam in texture. It is a medium high land and fertile well drained. The experiment was conducted a single factor Randomized Complete Block Design (RCBD) with three replication for each treatment. There were seven treatments in this experiment viz. T₁= sissoo (spacing 4m x 4m ) + guava (spacing 2m x 2m) + carrot; T₂= sissoo (spacing 4m x 4m) + lemon (spacing 2m x 2m) + carrot; T₃= sissoo (spacing 5m x 5m) + guava (spacing 2.5m x 2.5m) + carrot; T₄= sissoo (spacing 5m x 5m) + lemon (spacing 2.5m x 2.5m) + carrot; T₅= = sissoo ( spacing 6m x 6m ) + guava ( 3m x 3m )+ carrot; T₆= sissoo (spacing 6m x 6m) + lemon ( spacing 3m x 3m ) + carrot and T₇= sole cropping of carrot. From the treatments T₁ to T₆ were three layered woodlot consisted of sissoo at the top layer, guava and lemon at the middle layer; and carrot was at the ground layer and T₇ was in open condition. In the open condition T₇ received 100% sunlight; while sissoo + guava based Agroforestry system (T₁, T₃ and T₅) and sissoo + lemon based Agroforestry system (T₂, T₄ and T₆) allowed, respectively 33 to 54% and 45 to 69% sunlight for the growth of carrot. The upper layer sissoo tree was planted eight years ago i.e. July 1997. As the middle layer plant, guava and lemon both were five years old and were in full bearing condition. Standard pruning techniques for sissoo, guava and lemon tree were followed and the pruned materials were not added into the plot. Sissoo, guava and lemon tree were not dressed with fertilizer. But as the ground layer crop carrot was fertilized with recommended doses of fertilizers and the doses for carrot was 4 ton-120 kg-25kg-90kg kg as cowdung, N, P and K per hectare, respectively. Carrot seeds cultivar NK (New Kuroda) was sown in lines continuously 25 cm apart. After emergence, carrot plants were thinned out by maintaining 10cm distance from plant to plant. The carrot seeds were sown on 19 November 2005 and 20 November 2006.The experimental plots were kept weeds free by weeding frequently. The plots were irrigated whenever needed by using hose pipe and watering cane. Carrot harvesting was started at 90 days after planting and continued up to 125 days. Economics of various treatments was calculated taking into account the current costs of inputs and produce. The data on various growth and yield performance characters of the carrot was statistically analyzed to examine the significant variation of the results due to different shading condition as well as different tree-crop associations. The mean differences were evaluated by Least Significant Difference

Source of Information: J. Agrofor. Environ. 3 (2): 31-34, 2010; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The presence of tree canopies did not influence growth and yield of carrot although some adverse effect of trees was obvious in plants growing nearer to the tree rows. Despite some negative effects of upper layer trees on the growth, yield and physiological attributes, particularly at closer distance to the tree rows, a multistrata agroforestry is still beneficial as it ensure higher returns because of diversified products in comparison to sole cropping. Out of the three tree spacing, wider spacing i.e sissoo planted at 6m x 6m and guava or lemon planted at 3m x 3m proved to be the best tree spacing for little adverse effect on the growth and yield of carrot. So, this spacing may be adopted as suitable spacing in woodlot based MAF to cultivate ground layer crops for diversification and boosting economy of farmers in land scare Bangladesh circumstances.

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