MECHANICAL DEEP-PLACEMENT OF UREA FERTILIZER WITH A PRILLED UREA APPLICATOR SAVED FERTILIZER AND INCREASED YIELD FOR LONG DURATION WET LAND RICE VARIETY. Hossen MA, Saiful Islam AKM, Zaman MK, Khatun A, Alam MA and Bhuiyan MKA

BJPST: 15(2): 025-030 [July, 2017]                                 ISSN: 2305-1809 (Online version)
ABSTRACT
This experiment was conducted during the Boro season of 2016-2017 at Rajpat, Kashiyani to evaluate the performance of BRRI Prilled Urea Applicator (BPUA) and urea (N) fertilizer deep placement for long duration rice variety of BRRI dhan29. The treatments were T1 = Urea deep placement by BPUA (70% urea fertilizer of recommended dose), T2 = Urea deep placement by BPUA (80% urea fertilizer of recommended dose), T3 = Hand broadcasting (Recommended dose of urea @ 270 kg ha-1) and T4 = Control (-N). Both actual and theoretical field capacity found less for operation of the machine at 20% saving of fertilizer due to frequent inputs of fertilizer in the hopper of the applicator. Field efficiency of the applicator was 59 and 53% for operation at 30 and 20% saving, respectively. Actual saving percentage of urea fertilizer was noted 34 and 24% in the field against the calibration of 30 and 20% of saving. From 45 to 105 days after transplanting, plant height did not vary with the mode and rate of urea fertilizer application. However, there was no significance difference of plant height and number of tillers between70 and 80% of recommended dose of urea fertilizer application in the non-oxidize zone by the BPUA. Deep placement of the urea fertilizer (70 and 80% of recommended dose) gave significantly higher yield (6.7-6.8 t ha-1) compared to hand broadcasting of urea (6.1 t ha-1). Straw yield did not vary with the mode and rate of fertilizer. Harvest index was also found similar irrespective of treatments. The agronomic efficiency and partial factor productivity for N observed higher in urea fertilizer deep placement field compared to broadcasting whereas both the parameters did not varied for 30 and 20% saving rate. However, panicles hill-1 and filled grains per panicle did also not vary with the mode and rate of urea application while it was significantly higher than that of control. BPUA accounted the highest BCR (1.72 and 1.67) for 80 and 70% of the recommended urea fertilizer application in non-oxidized zone to the hand broadcasting of urea fertilizer (1.56). Farmer can apply 80% of urea fertilizer in non-oxidized zone by the BPUA for long duration rice variety.

Anwar_BRRI (corrected)

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