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Integrated Nutrient Management for Different Leafy Vegetables Using Arbuscular Mycorrhiza

M.A. Satter
Senior Scientific Officer (Ex.)
Soil Science Division, BARI, Joydebpur, Gazipur

D. Khanam
Principal Scientific Officer (Ex.)
Soil Science Division, BARI, Joydebpur, Gazipur

M.M. Rahman
ChiefScientific Officer (Ex)
Soil Science Division, BARI, Joydebpur, Gazipur

Abstract/ Executive Summary:

The experiment on integrated use of AM bio-fertilizer and chemical fertilizers in the leafy vegetables was conducted in the Soil Science Division, BARI, Gazipur during early kharif season 2005. Stem amaranth, kangkong and Indian spinach were used as the test crops. The experiments were laid out in RCB design with three replications. Five fertilizer treatments viz. T1: 100% chemical fertilizer (CF), T2: 100% CF + AM, T3: 75 % CF + AM, T4: 50% CF + AM and T5: Only AM were studied along with T6: Control. Full dose of chemical fertilizers in combination with AM produced significantly higher yield, which was followed by the identical yields with only 100% CF and 75% CF + AM treatments. Uptake of all the major and micro nutrients by these vegetables also followed the similar trend as of the yield with different fertilizer treatments. The result suggests that the yield and uptake of all the major and micronutrients by the crop might be improved greatly with AM inoculation. The rate of application of chemical fertilizers in these test crops might also be reduced to a certain extent without yield reduction. This is the result of one year experiment. The experiment would be continued.

Keywords: Stem, amaranthus, kangkong, Indian spinach, yield, nutrient uptake, root colonization, spore numbers

Location: Joydebpur

Start Date: 01-04-2003

End Date: 30-06-2005

Program Area:

Commodity:

Objectives:

01. To study the effect of combined application of arbuscular mycorrhiza and chemical fertilizer on the performance of vegetable, spices and fruit crop seedlings

Methodology:

The experiment on integrated use of AM bio-fertilizer and chemical fertilizers was conducted in the Soil Science Division, BARI, Gazipur during early kharif season 2005. The soil was slightly alkaline in reaction. Five fertilizer treatments viz. T1 = 100% chemical fertilizer (CF), T2 = 100% CF + AM, T3 = 75 % CF + AM, T4 = 50% CF + AM and T5 = Only AM were studied along with T6 = Control. Full dose of chemical fertilizer was 60-40-100-30 kg NPKS ha-1. Stem amaranth, kangkong and Indian spinach were used as the test crops. The experiments were laid out in RCB design with three replications. All of P, K and S were used as basal. In stem amaranth all of N was applied as top dress at a time at 20 days after sowing (DAS) but in kangkong and Indian spinach N was applied in two equal splits at 20 and 40 DAS. Cow dung was used at the rate of 10 t ha-1 as blanket dose in all the crops. The crops were sown during the second week of April, 2005. Kangkong and stem amaranth were sown in 25 cm and Indian spinach in 30 cm apart solid lines. Soil based AM inoculum containing about 200 spores and infected root pieces was used in the seed furrows of about 3 cm depth at the rate of 2 kg m-2. A soil layer of about 1 cm thickness was spread on the inoculum layer on which the seeds were sown. Stem amaranth was harvested at a time at 45 DAS. Kangkong was harvested three times by clipping at 45, 55 and 70 DAS. Indian spinach was also harvested for three times at 45, 60 and 75 DAS.

Source of Information: 01. Annual Research Report. 2004-05, Soil Science Division, BARI, Gazipur 02. Annual Research Report. 2005-06, Soil Science Division, BARI, Gazipur 03. Ten Years Soil Science Research Activities & Future Strategies. 2007, Soil Science Division, BARI, Gazipur

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 3,000/-  2 = 6,000/-

Total Budget (Tk.) : 3,000/-  2 = 6,000/-

Achievement/Findings:

Performance of Stem Amaranth Yield and Yield Components Full dose of chemical fertilizers in combination with AM bio-fertilizer produced significantly higher fresh yield of stem amaranth. Nutrient Uptake Uptake of major nutrients by stem amaranth with different fertilizer treatment revealed that as of the fresh yield, uptake of all the major nutrients (viz. N, P, K, Ca, Mg and S) was found significantly higher with 100% CF + AM treatment. Uptake of micronutrients like Cu, Zn and Fe by stem amaranth followed the similar trend as of the major nutrients with different fertilizer treatments but the trend in uptake of Mn was found different. AM Colonization Root colonization in the AM inoculated treatments varied from 31 to 38 percent. There was also some root colonization in the uninoculated treatments varying from 5 to 6 percent with the native AM fungi. Performance of Kangkong Yield Full dose of chemical fertilizer in combination with AM produced significantly higher fresh yield of kangkong among different fertilizer treatments studied Nutrient Uptake Nutrient uptake by kangkong followed the similar trend as of the fresh yield with different fertilizer treatments.. AM Colonization Root colonization in the AM inoculated treatments varied from 34 to 42 percent. Performance of Indian Spinach Yield The yield of Indian spinach was significantly influenced by different fertilizer treatments. Nutrient uptake As of the fresh yield uptake of all the major and micro-nutrients by Indian spinach was found highest with 100% CF + AM treatment. AM Colonization Root colonization in the AM inoculated treatments varied from 36 to 42 percent. Yield and uptake of all the major and micronutrients by stem amaranth, kangkong and Indian spinach might be improved greatly with AM inoculation.

Knowledge Management: