Effects of reduced rates of phosphorus and sulphur on the growth and yield of BRRI dhan29

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

Effect of Sulphur and Boron on Growth and Yield of Boro Rice in Calcareous Soil of Bangladesh

“…The pattern of grain yield was similar to that of panicle length. The result obtained in grain yield is in accordance with the findings of Islam et al [20]. Jawahar and Vaiyapuri [32] carried out a field experiment to study the effect of Sulphur on grain and straw yield of rice.…”

“…3 and Appendix III). Among the different levels of Sulphur, the maximum plant height (38.289 [20] who conducted an experiment to evaluate the effects of different rates and sources of Sulphur on the yield and yield components, nutrient content and nutrient uptake of rice and the longest plant was found from 16 kg S/ha applied as gypsum while the shortest plant was noticed with control treatment Sulphur.…”

“…Plants absorb S mainly in the form of inorganic sulphate (SO 4 2-) ions through the roots, thus sulphate must be present in soils in sufficient amount in order to meet crop S requirements [9] Insufficient availability of Sulphur to crop plants not only declines their growth and yield but can also deteriorate nutritional quality of the production [10,11]. The major causes of S deficiency in Bangladesh include intensive cropping with high yielding varieties of different crops, soils remaining water logged due to wet land rice culture, shifting toward virtually Sulphur free fertilizer, depletion of soil organic matter through the removal of organic residues from the field and loss of S by leaching in light textured soils in high rain fall areas [12]. Sulphur deficiency in crops results in a reduction of leaf area, seed number, seed weight, delayed floral initiation and anthesis [13].…”