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Interpretive Summaries:
2005 - On-Farm Research on Potassium Fertilization in Rainfed Pulses
2004 - On-farm Research on Potassium Fertilization in Rainfed Pulses
2003 - On-farm Research on Potassium Fertilization in Rainfed Pulses
On-Farm Research on Potassium Fertilization in Rainfed Pulses, 2005
These trials were organized to study the response of black gram to potassium (K), as well as the effectiveness of foliar fertilization in red loams. Trials were conducted in farmer holdings during kharifseason at 12 villages located in the three districts of Pudukkottai, Cuddalore, and Vellore. All soils tested low to medium in available K. In Tamil Nadu, more than 90% of the pulse growing area is rainfed and under poor and marginal lands.
Positive responses were measured both in terms of improved plant growth parameters such as plant height, number of branches/plant, number of pods/plant, number of seeds/pod, 100 seeds weight, and yield. Averaged over all 12 trials, results found a lowest yield of 260 kg/ha under the farmer practice of applying only nitrogen (N) and phosphorus (P) at 12-25 kg N-P2O5/ha. The NPK treatment of 12-25-30 kg N-P2O5-K2O/ha produced 540 kg/ha. Lastly, application of 12-25-30 kg/ha plus foliar sprays containing 2% diammonium phosphate (DAP), 0.5% zinc sulfate (ZnSO4), and 0.05% molybdenum (Mo) produced 692 kg/ha.
The results of 32 trials over two seasons reveal that optimum K rates depend on soil type. Black soils with high K status need only maintenance doses, while red soils with poor to medium K status require higher doses to obtain improved pulse yields. SZ India-44
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