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Effect of Crop Establishment Practices, Residue and Starter N Dose on Performance of Vegetable Based Cropping System and N Mineralization and Soil Health (2019–2020)

Md. Khairul Alam
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

M.J. Alam
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

A.T.M.A.I. Mondol
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

S. Akhter
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

Abstract/ Executive Summary:

Field experiments on Broccoli-Amaranth-T.aman rice cropping pattern were conducted in Grey Terrace soil of Joydebpur under AEZ-28 during rabi season 2019-2020 to find out the performance of crops in the vegetable-based cropping system, to study N mineralization under starter dose of N and to find out the best combination of crop establishment practice, residue and starter N dose for vegetable-based cropping system and soil health (Kader et al. 2016). There were 2 types of tillage as Strip tillage (ST) and conventional tillage (CT) and two residue retention practices under which 2 starter N doses (with and without N-starter dose) will be tested. The treatments will be replicated four times. As the reported crop broccoli was the opener of the experiments and the cropping systems, the effect of the residue retention practices was not observed. According to the principal research question of the experiment, the effect of starter doses was not significant either. However, tillage practices have a significant effect on yield and yield parameters. Tillage with starter doses had an increased yield of broccoli. The third crop monsoon rice (T. aman) is at tillering stage.

Keywords: Soil health, Vegetable, Fertilizer, N mineralization

Location: Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

Start Date: 00-00-2019

End Date: 00-00-2020

Program Area: Farming System

Commodity: Amaranth, Broccoli, Rice, Soil Health

Objectives:

The study was conducted to find out the performance of crops in the vegetable-based cropping system, to study N mineralization under starter dose of N and to find out the best combination of crop establishment practice, residue and starter N dose for vegetable-based cropping system and soil health.

Methodology:

Field experiments on Broccoli-Amaranth-T.aman rice cropping pattern were conducted in Grey Terrace soil of Joydebpur under AEZ-28. The experiment was started at BARI central research farm during rabi season in 2019-2020. The tillage operations such as strip tillage with VMP (versatile multi-crop Planter) and conventional tillage with power tiller were employed in combination with two N-starter doses and two residue retentions. Thus 8 treatment combinations were arranged in a split-plot design with four replications. The plot size was 3.0 m × 3.15 m. The tested variety of broccoli was Green king and the spacing of seedling transplanting was 60 cm × 45 cm. The crops were fertilized with soil test based (STB) fertilizer dose as per FRG-2018 (BARC, 2018). The fertilizer dose was N₉₆P₁₄K₄₉S₉Zn_0.3B_0.6 kg ha^-1 and 5 kg extra N ha^-1 was applied as starter N-dose (N₁₀₁P₁₄K₄₉S₉Zn_0.3B_0.6 kg ha^-1) with 3.0 t ha^-1 decomposed cowdung. Broccoli seedlings were transplanted on 03 December 2019 and the crop was harvested on 24 February 2020. All decomposed cowdung, phosphorus, gypsum zinc sulphate and boric acid were applied during final land preparation. Urea was applied in three equal splits at 7 DAT, 25 DAT and 45 DAT and for starter N-dose 5% extra urea was applied 15 DAT. MoP was applied in three equal splits at Basal 20 DAT and 40 DAT. Basically, it was not possible to maintain strip-tillage during land preparation because there were five years of pattern crops and to make the field homogenous, an inversion tillage was applied. After transplanting seedlings all the rules for strip tillage were followed. All intercultural operations were done as per the requirement of the crop. Residues were incorporated or retained from the second crop. The collected soil samples (initial) were dried at room temperature after these were mixed thoroughly, grinded, sieved with a 2 mm sieve and preserved in plastic containers for subsequent laboratory analysis. Soil samples were then analyzed for SOM, total N and P. The SOM was determined by wet oxidation, total N by a modified Kjeldahl method (Page et al. 1989) and total P by using the SnCl₂ reduction method (Black, 1965). The pH was determined through the glass electrode pH meter method (Jackson 1962), K and S were determined through NH₄OAC method (Hanlon and Johnson, 1984) and the turbidimetric method (Sperber, 1984), respectively. Micronutrients were analyzed using atomic absorption spectrophotometer. The particle size distribution of the initial soil was analyzed by the hydrometer method (Black, 1965) and the textural class was determined using the USDA texture triangle. The BD of the soil samples was determined by the core sampler and pycnometer method (Karim et al., 1988). Moisture content was determined by the gravimetric method (Black, 1965). Field capacity was done through the pressure plate method.

Source of Information: Annual Research Report 2019–2020, Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Tillage with starter doses performed significantly better to increase the yield and yield contributing characters of broccoli under Broccoli-Amaranth-T. Aman cropping pattern. The third crop T. aman has been transplanted which is now at early tillering growth.

Knowledge Management: Report/Proceedings