M. I. Nazrul*
On-Farm Research Division, Bangladesh Agricultural Research Institute, Sylhet, Bangladesh
M. R. Islam
On-Farm Research Division, Bangladesh Agricultural Research Institute, Gazipur, Bangladesh
Nutrient management, Cropping pattern, Yield
At the farmer’s field of Farming System Research and Development (FSRD) site, Jalalpur, under South Surma Upazilla of Sylhet district
Farming System
The experiment was carried out in the Surma-Kushiyara Floodplain soil at the farmer’s field of Farming System Research and Development (FSRD) site, Jalalpur, under South Surma Upazilla of Sylhet district in the medium high land under AEZ-20 for the three consecutive years 2013- 2016 to determine economic combined dose of organic and inorganic fertilizers for Potato-T. aus -T. aman cropping pattern. The varieties for potato, T. aus and T. aman rice were Diamont, BRRI dhan48, and Binadhan-7, respectively. The fertilizer treatments used in the experiment was based on Fertilizer Recommendation Guide (FRG, 2012). Soil samples were collected from farmers’ field and analyzed at SRDI laboratory, Sylhet for chemical analysis. Four different fertilizer packages viz. T1: Soil test based (STB) fertilizer dose for high yield goal (HYG), T2: T1+ CD 5 t ha-1, T3: T1 along with CD 5 t ha-1 in IPNS approach and T4: Farmers practices (average of 25 farmer’s data) were tested. In all the crops N, P, K, S, and Zn were applied through urea, triple super phosphate, murite of potash, gypsum, and zinc sulphate, respectively.
The experiment was laid out in a randomized complete block design with six dispersed replications. The unit plot size was 10 m 4 m for the whole cropping pattern. On basis of soil analysis, fertilizer doses were estimated with the help of soil analysis value as per treatment. Almost all the nutrients were low to very low except Zinc (medium) and Boron (low). 109
The potato (Solanum tuberosum L.) tubers were sown from 20-25 November in three consecutive years. Seeds (Tubers) were sown at the rate of 1.5 t ha-1 and spacing was 60 cm x 25 cm. Entire amount of cowdung, TSP, MoP, gypsum, and zinc sulphate and one half amount of urea was applied at final land preparation and remaining one-half urea was top dressed at 30-35 days after seeding (DAS) before earthing up. Two irrigations were done at 20-25 and 45-50 DAS. The fungicides, Indofil and Secure were applied at 35 and 45 DAS, respectively for late blight control. The tuber of potato was harvested from 25-27 February in three consecutive years.
After potato harvest, the second crop T. aus rice (Oryza sativa) was transplanted on the same plot from 15-20 April. Twenty-five-days old seedlings were used with spacing was 20 cm x 15 cm. Half of N, the full dose of other fertilizers were applied during final land preparation. The rest of N-fertilizer was top dressed at 35 days after transplanting (DAT). Once weeding was done at 30 DAT. The insecticide Dursban 20 EC was applied for rice bug control. The crop was harvested from 25-28 July at full maturity. Third crop T. aman rice was transplanted from 25-30 July. Twenty days old seedlings were used with spacing was 20 cm × 15 cm. Except N- fertilizer the full dose of other fertilizers were applied during final land preparation. N-fertilizer was top dressed in two equal splits at 30 and 45 DAT. Dimecron insecticide was applied for controlling rice stem borer. The crop was harvested from 05-10 November at full maturity. Data on tuber of potato and grain yield rice were recorded from 6m2 area. Collected data were analyzed statistically and the means were separated by LSD at 5% level (Gomez and Gomez, 1984). The cost and return analysis were done considering the prices of nutrients, products and additional costs only following the method suggested by Perrin et al. (1979).
Bangladesh Agron. J. 2017, 20(2): 107-113
Journal