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    EFFECTS OF FERTILIZER, MANURE AND WATER MANAGEMENT ON THE NUTRIENT AVAILABILITY, LEACHING, SOIL FERTILITY AND PRODUCTIVITY UNDER RICE- RICE CROPPING PATTERN
    (DEPARTMENT OF SOIL SCIENCE, 2017) SAMPA, MOSAMMAT SELINA AKTAR
    Three experiments were conducted at the net house and research field of Sher-e-Bangla Agricultural University during January 2013 to June 2014 to study the effects of fertilizer, manure and irrigation on the nutrient availability, leaching, soil fertility and productivity under rice-rice cropping pattern. A net house experiment with 30 (2 levels of irrigation x 5 fertilizer treatments x 3 replications) undisturbed soil columns (40 cm length and 30 cm diameter) was set up at a net-house of SAU, with rice growing in boro and T. aman seasons during January 2013-December 2013. Soil cores were placed on the plastic containers and leachate collection systems were developed. BRRI dhan29 and BRRI dhan33 were grown on the cores with two levels of irrigation (I 1 : continuous flooding I 2 : saturated condition) and fertilizer treatments (T 0 : Control T 1 : RDCF, T 2 : 50% NPKS + 5tha -1 cowdung, T 3 : 50% NPKS + 5 tha -1 compost, T 4 : 50% NPKS+ 3.5 tha -1 poultry manure. The leachate samples were analyzed for nutrient during the growing seasons. The leachate nutrient concentration varied with irrigation, fertilizer and time of sample collection. Higher levels of leachate N, K and S concentrations were found in the T 4 treatment. Phosphorus leaching decreased with increasing days from transplantation but N and S leaching were in similar trend during the rice growing period. Application of organic plus inorganic fertilizer increased the level of organic matter, P and K availability of post experiment soils. Application of poultry manure increased more the soil pH, available P and level of organic matter in post-experiment soils. The continuous flooded irrigation in combination with different fertilizer treatments increased the level of K in post-harvest soil. A field experiment involving 2 levels of irrigation and 8 fertilizer treatments (2x8x3= 48 plots) were applied in the boro rice field soil and without rice planted soil (PVC pipe installed fallow area) during January 2014-June 2014. The experiment was laid out in split plot design with irrigation (I 1 : traditional irrigation i.e. continuous flooding and I 2 : saturated condition) to the main plots and fertilizers to the sub plots. The fertilizer treatments were T 0 =Control, T 1 =N 120 P 25 K 60 S 20 Zn 2 (RDCF), T 2 =50% NPKS + 5 tha -1 cowdung, T 3 =70% NPKS + 3 tha -1 cowdung, T 4 =50% NPKS + 5 tha compost, T 5 =70% NPKS + 3 tha -1 compost, T 6 =50% NPKS + 3.5 tha -1 poultry manure, T 7 =70% NPKS + 2.1 ton poultry manure ha -1 . Boro- T. aman rice experiments were conducted previously in the same plots with the application of same treatments from 2012. The effect of residual and renewal application of fertilizer and manure influenced the pore-water nutrient availability, yield and the fertility of post experiment soils. The higher grain yields were obtained in inorganic plus organic treatments. The highest grain yield was obtained from I 2 T 7 , I 2 T 5 and I 1 T 5 treatment combinations. The higher concentrations of N, P and K were found in the pore-water of T 6 and T 7 treatments where higher yields were also obtained. Porewater P concentrations decreased with increasing days after transplantation. At flowering stage, the highest pore-water P was found in I 1 T 4 treatment combination. Higher concentrations of pore-water K were found into the core (fallow area) than rice root zone area (outside) during the cropping season. Higher N, P and K concentrations were found in the post-harvest soils (root zone area and fallow area) where manures were applied. The higher levels of organic matter were found in the post-harvest soils of T 2 treatment of rice root zone area (1.60%) and the soils of fallow area (1.59%). The application of poultry manure increased the pH of the soil. Another field experiment was conducted at SAU Farm with rice growing in boro and T. aman seasons during July 2013 to June 2014. The three levels of irrigation (I 1 : continuous flooding, I 2 : saturated condition and I 3 : Alternate wetting and drying) and eight fertilizer treatments (similar to expt. 2) were applied in this experiment. The highest T. aman rice yield was found from I 2 T 2 and the highest grain yield of boro rice (7.94 t/ha) was recorded with the treatment combination I 1 T 7 . The pH of 6.9 was obtained in the soil where inorganic fertilizer and poultry manure were applied.
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    EFFECT OF NEXT GENERATION FERTILIZER PRODUCTS ON GROWTH AND YIELDS OF DIFFERENT CROPS
    (Sher-e-Bangla Agricultural University, Dhaka, Bangladesh, 2017-06) ABDULLAH AL - FAROQUE, MOHAMMAD
    To reduce the existing yield gap between research and farmer’s field, three separate experiments were carried out during the period from March, 2014 to June, 2015 at the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh. To evaluate the effects of next generation fertilizers along with other recommended fertilizers on the growth, yield and soil chemical properties, the research was conducted based on selected maize, tomato and rice varieties. The experiments were laid out in RCBD method with three replications. The first experiment was conducted on maize in kharif season with eight treatments including control viz. T 0 = control (no fertilizer), T 1 = recommended dose N 250 P 50 K 100 S 25 Zn = American NPK + N 250 P 50 K 100 S 25 Zn 2 B 1 , T 3 = Bio-forge + N 250 P 50 K 100 S 25 Zn = Wuxal + N B 250 1 P 50 and T K 7 100 S 25 Zn 2 B 1 , T = Nitro Plus + N 5 = Peak + N 250 P 50 K 250 100 S P 50 25 K Zn 100 2 S B 25 1 Zn 2 B 1 , T 6 = Root Feed + N 2 2 B B 250 and three maize varieties namely V = BARI Hybrid Bhutta-5 , V 2 = BARI Hybrid Bhutta-6 & V = BARI Hybrid Bhutta-9. Growth and yield contributing characters mainly plant height, cob length, cob weight, 100-kernel weight and kernel yield of maize crop were significantly influenced by the next generation fertilizers. Bio-forge along with other recommended fertilizers performed the best compared to other treatments of the study in aspect of kernel yield (5.95 tha -1 3 ) and statistically similar result showed by Root feed along with other recommended fertilizers and produced 5.12 tha -1 kernel yield. Among the varieties, BARI Hybrid Bhutta-9 performed the best compared to other two varieties. The second experiment was conducted on tomato in rabi season with six treatments including control viz. T = control (no fertilizer), T 1 = recommended dose N 140 P 35 K 75 S 15 Zn 2 B 1 kg ha -1 = Bio-forge + N 140 Zn 2 P B 35 1 K , T 75 5 S 15 Zn 2 B 1 , T 3 =Wuxal Super + N = Nitro Plus + N 140 P 35 K 75 S 15 Zn 140 2 B P 1 35 K 75 S 15 Zn 2 B 1 , T 4 , T 1 1 kg ha ,T P 2 = Root Feed + N and three tomato varieties namely V = BARI Tomato-2, V 2 = BARI Tomato-14 & V = BARI Tomato-15. Among the next generation fertilizers, Bio-forge along with other recommended fertilizers performed the best compared to other treatments of the study in aspect of growth and yield contributing characters mainly plant height, flower cluster plant -1 3 , number of fruits cluster -1 , fruit plant -1 4 50 K 100 140 1 1 P and fruit yield (114.43 t ha ). Among the varieties BARI Tomato-14 performed the best compared to other two varietal treatments. The third experiment was conducted in boro rice with six treatments including control viz T 0 = Control (no fertilizer), T 1 =recommended dose N 140 P 20 K 60 S 18 Zn 2 kg ha -1 = Bio-forge + N 140 P 20 K 60 S 18 Zn 2 , T 3 = Wuxal Super + N 140 P 20 K 60 S 18 Zn 2 , T 4 = Root Feed + N = Nitro Plus + N 140 P 20 K 60 S 18 Zn 2 and three rice varieties namely V 1 , T 140 P 2 20 K = BRRI dhan29, V = BRRI dhan28 & V = BRRI dhan58. Among the next generation fertilizers, Bio-forge along with other recommended fertilizers performed the best compared to other treatments of the study in aspect of growth and yield contributing characters mainly plant height, effective tiller hill 3 , panicle length , filled grain panicle -1 , 1000-grain weight, harvest index and grain yield (8.61 tha ). Among the varieties BRRI dhan29 showed best performance compared to other two treatments. There was no significant variation found for soil pH, organic carbon in postharvest soil of three experimental fields due to application of next generation fertilizers. Available S in maize field, total N content, available P and available S in tomato field and total N content, available P and available S in rice field showed a positive significant change. The next generation fertilizer viz. Bio-forge and Root feed along with other recommended fertilizers would be ideal for better crop growth and yield. -1 -1 60 S -1 , T S 35 18 2 25 K Zn 2 Zn 75 2 S -1 2 0 15 , T 5