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Studies on Weed Biomass, Growth and Yield of Maize and Spinach-red Amaranth Under Intercropping Systems

F. Ahmed
SO
Agronomy Division, Gazipur

M.A.H.S. Jahan
SO
Agronomy Division, Gazipur

Abstract/ Executive Summary:

An experiment on maize/spinach-red amaranth intercropping was conducted at Joydebpur, Jessore and Jamalpur during rabi season of 2002-2003 to study the intercropping effect on weed biomass, growth and yield of maize and spinach-red amaranth. The treatments were: T₁ # sole maize (75 cm x 25 cm), T₂ # sole spinach-red amaranth (15 cm apart line sowing), T₃ # Maize normal row + 1 row (16.67%) of spinach-red amaranth, T₄ # Maize normal row + 2 rows (33.33%) of spinach-red amaranth, T₅ # Maize normal row + 3 rows (50%) of spinach-red amaranth, T₆ # Maize paired row + 3 rows (20%) of spinach-red amaranth, T₇ # Maize paired row + 5 rows (33.33%) of spinach-red amaranth and T₈ # Maize paired row + 7 rows (46.67%) of spinach-red amaranth. Fertilizers @ 250 kg N, 120 kg P₂O₅, 120 kg K₂O and 30 kg S/ha were applied. Seeds f maize and Spinach were sown on November 27 and 28 and December 2, 2002 at Joydebpur, Jessore and Jamalpur, respectively. Maize spacing was 75 cm x 25 cm and 37.5/150/37.5 cm for normal and paired rows, respectively, Sole spinach-red amaranth was sown at 15 cm apart in line. Intercropping reduced weed biomass (10-40%) compared to sole maize. Growth and yield of maize was reduced due to intercropping. Highest land equivalent ratio (1.93) and maize eqivalent yield (16.73) was obtained from maize normal row + 3 rows Spinach –red amaranth (T₅) at Joydebpur, Jessore and maize paried row + 7 rows Spinach-red amarantg at Jamalpur. However, highest net returns (Tk. 91986/ha) at Joydebpur, Tk. 64712/ha at Jessore and Tk. 69952/at Jamalpur were also obtained from the T₅ treatment at all the locations. Result revealed that 3 rows Spinach – red amaranth with maize normal planting system may be feasible for higher economic benefit.

Keywords: Weed biomass, Growth and yield, Maize, Spinach, Red amaranth, Intercropping

Location: Joydebpur, Jessore and Jamalpur

Start Date: 02-12-2002

End Date: 05-04-2003

Program Area: Farming System

Commodity: Maize, Amaranth, Spinach

Objectives:

To study the effect of intercropping on weed biomass and to find out suitable planting geometry

Methodology:

The experiment was conducted at the Faarm of Central Research Station of BARI, Joydebpur and RARS Jessore and Jamalpur during rabi season of 2002-2003. Eight treatments were tested in randomized complete block design with three replications. The treatments were as follows: T₁ = Sole Maize (75 cm x 25cm) T₂ = Sole Spinach -red amarnath (15 cm apart line sowing) T₃ = Maize normal row + 1 rows (16.67%) of spinach-red amarnath T₄ = Maize normal row + 2 rows (33.33%) of spinach-red amarnath T₅ = Maize normal row + 3 rows (50%) of spinach-red amarnath T₆ = Maize paired row + 3 rows (20%) of spinach-red amarnath T₇ = Maize paired row + 5 rows (33.33%) of spinach-red amarnath T₈ = Maize paired row + 7 rows (46.67%) of spinach-red amarnath The unit plot size was 6m x 4.5 m. Seeds of Maize and spinach were sown on Nov 27, Nov 28 and December 2, 2002 at Joydebpur, Jessore and Jamalpur respectively. Maize spacing was 75 cm x 25 cm and 37.5/150/37.5 cm for normal and paired rows, respectively. Sole spinach-red amarnath was sown at 15 cm apart in line. The unit plot size was 4.5m x 4m. Seeds of Maize were sown on December 2,2002. Maize spacing was 75 cm x 25 cm and 37.5/150/37.5 cm for normal and paired rows, respectively.

Source of Information: Annual Report, Agronomy Division 2002-2003, BARI

Article Link (Online Journal):

Funding Source:

1. Asian Development Bank

Budget: 10,000/-

Total Budget (Tk.) : 10,000/-

Achievement/Findings:

Growth and yield of maize was reduced due to intercropping. Highest land equivalent ratio (1.93) and maize eqivalent yield (16.73) was obtained from maize normal row + 3 rows Spinach –red amaranth (T₅) at Joydebpur, Jessore and maize paried row + 7 rows Spinach-red amarantg at Jamalpur. However, highest net returns (Tk. 91986/ha) at Joydebpur, Tk. 64712/ha at Jessore and Tk. 69952/at Jamalpur were also obtained from the T₅ treatment at all the locations. Result revealed that 3 rows Spinach – red amaranth with maize normal planting system may be feasible for higher economic benefit.

Knowledge Management: Report/Proceedings