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Rice Growth, Grain Yield, and Floodwater Nutrient Dynamics as Affected by Nutrient Placement Method and Rate

^a Indira Gandhi Agricultural University (IGAU), Krishak Nagar, P.O. Box 94, Raipur (CG), 492006, India
^b International Center for Soil Fertility and Agricultural Development (IFDC), P.O. Box 2040, Muscle Shoals, AL, 35662

View larger version (29K): [in this window] [in a new window]   Fig. 1. Weather conditions as represented by daily rainfall (mm), maximum and minimum temperature (°C), and sunshine duration (h) during the 2001 and 2002 experimental years.

View larger version (35K): [in this window] [in a new window]   Fig. 2. Dynamics of floodwater NH4+–N as influenced by N rates and application methods–broadcast incorporation of urea vs. deep placement of briquettes–for 2001 and 2002 season.

View larger version (13K): [in this window] [in a new window]   Fig. 3. Dynamics of floodwater P as influenced by deep placement, conventional application of P, and P rates.

View larger version (10K): [in this window] [in a new window]   Fig. 4. Dynamics of floodwater potassium as influenced by deep placement of N–P–K briquettes and broadcast incorporation of N, P, and K.

View larger version (15K): [in this window] [in a new window]   Fig. 5. Rice grain yield response to rates of P application with broadcast incorporation of SSP, urea at 53 kg N ha–1 and 25 kg K ha–1. Bars with same letters for a given year are not significantly different at LSD5%.

View larger version (14K): [in this window] [in a new window]   Fig. 6. Rice grain yield response to N as influenced by P rates and N application method (deep-placed urea-N briquette vs. conventionally applied prilled urea) for 2 yr with a common K rate of 25 kg ha–1.