Abstract
Balanced fertilization is a pre-requisite for better rice production and it is necessary to determine optimum combination of nutrient elements for application. An experiment was conducted at the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh during Boro season to investigate the effects of reduced rates of phosphorus (P) and sulphur (S) on the growth, yield, nutrient content and uptake by rice. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications and eight treatments viz. T1: Control, T2: Recommended Fertilizer Dose (RFD), T3: RFD -20% P, T4: RFD-40% P, T5: RFD-20% S, T6: RFD-40% S, T7: RFD-20% PS and T8: RFD-40% PS. The recommended fertilizer doses were 125 kg N ha-1, 25 kg P ha-1, 70 kg K ha-1, 15 kg S ha-1 and 3 kg Zn ha-1 supplied from urea, TSP, MoP, gypsum and zinc sulphate, respectively. There was significant effect of reduced rates of P and S fertilizers on rice yield compared to control. The highest grain yield of 5.10 t ha-1 and straw yield of 7.02 t ha-1 were recorded from treatment T2 (RFD) that produced the maximum values of all the yield components and the highest content and uptake of nutrients. The performance of T2 and T3 (RFD - 20% P) was statistically similar in producing yield parameters, yields, nutrient contents and uptake by rice. Again, 20% reduced rate of S (T5) or of P and S (T7) caused significant yield reduction, poor yield parameters and less nutrient uptake compared to T2. Thus, the recommended fertilizer dose and the treatments where 20% P was reduced from the RFD are equally efficient in increasing yield as well as enhancing nutritional quality of rice. This reduction of chemical fertilizer could help lessen the cost of rice production with decreasing environmental risk.
 Asian J. Med. Biol. Res. March 2021, 7(1): 40-47
Highlights
In Bangladesh, rice is the staple food of about 150 million people of Bangladesh providing nearly 48% of rural employment, about two-third of total calorie supply and about one-half of the total protein intakes of an average person in the country (BBS, 2018)
The results showed that use of recommended doses of chemical fertilizers was more efficient in improving yield parameters of rice
From the present study, it is distinct that the recommended dose of fertilizers provided the highest yield of BRRI dhan29 with better nutrient content and uptake
Summary
In Bangladesh, rice is the staple food of about 150 million people of Bangladesh providing nearly 48% of rural employment, about two-third of total calorie supply and about one-half of the total protein intakes of an average person in the country (BBS, 2018). About 80% of the total cultivable land is used for production of rice that contributes one-half of the agricultural GDP and one-sixth of the national income in Bangladesh (BBS, 2018).Out of total 36.4 million metric tons rice production in this country during the year 2018/19, boro, aman and aus accounted for 53.8, 38.6 and 7.6%, respectively (Ahmed and Bakhtiar, 2020). Soil is the store house of plant nutrients. Plants derive 14 essential nutrient elements from the soil (White and Brown, 2010). To achieve maximum rice yields, it is essential to have sufficient content of P in soil
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