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
Urea, Soil physico-chemical properties, Fertilizer, Agroecological zone, Prilled urea
Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh
Farming System
Fertilizer, Soil Health
The field experiment was conducted at the Bangladesh Agricultural Research Institute (BARI), Gazipur, Bangladesh, for the rabi season of 2018-2019. The experimental site is located at the centre of the agroecological zone of Madhupur tract (AEZ-28) at about 23° 59′ 19′′ north latitude and 90° 24′ 33′′ east longitude having a mean elevation of 8.4 m above mean sea level. The soil belongs to the Chhiata series of the Grey Terrace soils (Aeric Albaquept) under the order Inceptisols in the USDA Soil Taxonomy (Huq and Shoaib, 2013). The morphological and taxonomical characteristics of the experimental site. The textural class was clay loam having soil pH 6.2. From late October to mid-March, the minimum and maximum temperatures were in the lowest range whereas the periods from October to May are virtually dry. The relative humidity (%) varied between day and night of which at day time relative humidity was about 90 (%) and at night it fluctuated to a wide range from 43 to 85% in February and March, respectively. The first crop of the cropping system was garden pea (Pisum sativum Linn cv. BARI motorsuti- 3) which was collected from the Horticulture Research Centre (Olericulture Research Division) of BARI, Gazipur. The experiment was laid out in a split plot design with three replications. The experimental design was performed as follows: strip tillage (ST: the sowing was done with strip planter developed by FMPE division, BARI), conventional tillage (CT: ploughed by power tiller maintaining depth by depth control lever up to 14-16 cm depth). The N type treatments were not employed in garden peas but the N types were applied to urea super granule (USG) as deep placement and prilled urea which was broadcasted. Tillage practices were assigned in the main plots and N types were assigned in the subplots. The unit plot size was 7.2 m × 4 m. The fertilizer doses for garden pea (BARI motorsuti- 3) were N 50 kg ha-1. Three supplemental irrigations were applied at 1, 15 and 30 days after sowing. Weeds in strip plots were controlled partially by spraying a post-emergence selective herbicide, Affinity (Carfentrazone ethyl + Isoproturon), @ 2.5 g L-1 water at 20 DAS and only one hand weeding was done at 20 DAS for full elimination of weeds. The subsequent crop aroid (BARI paanu katchu-1-latiraaj) was transplanted on 11 March 2019. The fertilizer dose applied was N150P35K125S23, Zn4, B1 kg ha-1 and cowdung 10 t ha-1. Most of the fertilisers were applied during land preparation except urea. One-fourth of urea was applied after sapling establishment. After 40 days one-fifth of the rest of the efertiliser was applied. The remaining four splits were given at 15 days interval. Weeding and irrigation were applied as when necessary. The soil moisture was monitored intensively with gravimetric method (Black 1965). Garden pea seeds (BARI motorsuti-3) were sown on the 15 December 2019 followed by irrigation. The row spacing maintained for the pea was 20 cm. The pea was harvested on 11 February 2020. The monsoon crop was rice and the tested rice variety was BRRI dhan 57. The crops were fertilized with soil test based (STB) fertilizer dose as per FRG-2018 (BARC, 2018). The fertilizer doses of rice was N102 P5 K54 S10Zn2.0 kg ha-1 for the T. aman. T.aman seedling were transplanted on 30 August, 2019 and crop harvested on 04 December 2019. For T.aman all TSP, MoP, gypsum, zinc sulphate were applied during final land preparation. Urea was applied in three equal splits at 7 DAT, 25 DAT and 40 DAT. All intercultural operations were done as per the requirement of the crop. Germination percentage of seeds from each treatment was calculated on the basis hypocotyls appeared above the surface of soil. Ten sample plants from each plot were selected from 1.5 m2 quadrates (quadrates were set just after sowing) to determine various phenological characters such as plant height (cm), number of branches plant-1, number of pods plant-1, pod length, number of seeds pod-1, green pod yield, seed yield and stover. The plant height were measured in fresh using a ruler from the point near to soil surface to the longest portion of the plant tip at maturity and then average was calculated. The parameters such as number of branches plant-1, number of pods plants-1, number of seeds pods-1, fresh weight of shoot and dry biomass of shoot and the grain yields (kg ha-1) were assessed. Soil samples were collected initially and after harvest (at 56 DAS). The collected soil samples were dried at room temperature mixed thoroughly, grinded, sieved with a 2 mm sieve and preserved in plastic containers for subsequent laboratory analysis. Plant samples were also collected for determining N uptake at harvest which were then analysed in the lab for N content determination. The initial soil samples were then analyzed for SOM, total N, P, K and S. The SOM was determined by wet oxidation (Jackson 1973), total N by a modified Kjeldahl method (Page et al., 1989) and total P by using the SnCl2 reduction method (Black, 1965). ThepH was determined through glass electrode pH meter method (Jackson 1962), K and S were determined through NH4OAC method (Hanlon and Johnson, 1984) and turbidimetric method (Sperber, 1984), respectively. Micronutrients were analyzed using atomic absorption spectrophotometer. Particle size distribution of the initial soil was analysed by the hydrometer method (Black, 1965) and the textural class was determined using the USDA texture triangle. The BD of the soil samples were determined by core sampler method (Karim et al., 1988). Moisture content was determined by gravimetric method (Black, 1965). Moisture contents at field capacity, 1 bar and 2 bars were measured though pressure plate method. The data collected were subjected to descriptive statistics to calculate germination percentage by using the Ms-Excel spreadsheet version 2010. Statistics 10 program was employed to determine analysis of variance (ANOVA) of different phenological data of garden pea and the mean values were compared with least significant difference (LSD) at value 0.05.
Annual Research Report 2019–2020, Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh
Report/Proceedings