NORGANIC FERTILIZERS USE EFFICIENCY COUPLED WITH ORGANIC MANURES UNDER RICE-RICE CROPPING PATTERN IN BANGLADESH

Abstract

ABSTRACT

A series of research works on the effects of different inorganic fertilizers and organic manures on growth, yield and nutrient content of Boro rice (BRRI dhan29) and T. aman rice (BRRI dhan49) were conducted at the farmers field of Shakhepur, Tangail and Shere Bangla Agricultural University (SAU) Farm, Dhaka, respectively during period from 2013-2016. The research works consisted of 4 levels (0, 50, 75 and 100% of recommended dose) of each organic manure such as compost (C), cowdung (CD) and poultry manure (PM) and 4 levels (0, 50, 75 and 100% of recommended dose) of inorganic fertilizers (Urea, TSP and MoP) which were laid out in a randomized complete block design (RCBD) taking sixteen treatments with three replications in both season. Aman rice (BRRI dhan49) was grown on the same plots after harvesting of boro (BRRI dhan29) rice. Combined application organic manure (compost, cowdung and poultry manure) and inorganic fertilizers (Urea, TSP and MoP) produced significantly higher yield over single application of inorganic fertilizers. The performance of poultry manure among the organic manure placed superior position than that of cowdung and compost. Application of 100% organic manure and 100% inorganic fertilizer gave higher results in most growth yield and yield related parameters. Statistically similar observation was found in treatment combination 100% organic manure and 75% inorganic fertilizer. In case of interaction, both BRRI dhan29 and BRRI dhan49 gave highest plant height, higher number of effective tillers hill -1 , longer panicle, higher 1000-grain weight, higher number of filled grains panicle -1 , higher grain yield, straw yield and BCR. After economic analysis full dose combination (100% organic manure and 100% inorganic fertilizer) and (100% organic manure and 75% inorganic fertilizer) shows better performances. Application of above mentioned two treatment combination contribute the highest grain yield in both boro and aman rice. The combined application of organic manure (compost, cowdung and poultry manure) and inorganic fertilizers (Urea, TSP and MoP) is might be the suitable management for increasing grain yield. The combination also highlights the significant effects on N, P and K contents by grain and straw of both season. The post harvest properties of soil of both BRRI dhan29 and BRRI dhan49 also varied significant positive effects under full dose treatment combination. The content of post harvest soil properties were increased due to application of above mentioned two combination of organic manure and inorganic fertilizer, compared to initial status, which refer to point out that soil fertility status in increase due to application of organic manure (compost, cowdung and poultry manure) and inorganic fertilizers (Urea, TSP and MoP). On the basis of economic analysis (benefit cost ratio) it can be summarized that above two treatment combination shows statistically similar results and considering inorganic fertilizer use efficiency comparatively low cost can be used for profitable cultivaiton of both boro rice (BRRI dhan29) and aman rice (BRRI dhan49). So treatment combination (100% Organic Manure +75% Inorganic Fertilizer) used best for both boro and aman season.