Nitrogen;
Nitrogen increases plant hight, panicle numbers, spikelets number, number of filled spikelets and gives green colour to crop. Nitrogen is most important nutrient in term of overall yield. Deficiency of nitrogen apears on older leaves, which turn pale green colour. Deficiency of nitrogen causes stunted growth and less number of tillers in rice. Average nitrogen requirement for rice is 60 to 80kg/acre
#Phosphorus; Phosphorus is important in early growth and in reproductive growth. It helps in roots development and increases tillering in rice. It also affects grain filling in spikelets. Deficiency of phosphorus causes purplish colour of leaves with less number of tillers and leaves. Average phosphorus requirement for rice is 35 to 45kg/acre.
#Potassium;
Potassium is important in spikelets fertility, resistance against diseases, increases grain size and weight, increases stem thickness which helps against lodging. Potassium is absorbed by rice in large quantities. Its deficiency symptoms are spots on leaves. Deficiency causes less filling of spikelets and less weight of grains. Crop will be easily lodged (will fall) in heavy winds. Potassium requirement for rice ranges from 70 to 90 kg/acre.
#Zinc;
Zinc is important for metabolism of auxin (growth hormone) which directly affects tillering capacity. So during vegetative growth zinc is very important for better yield.
#Boron;
Boron is important in reproductive growth, it helps in grain filling and gives better yeild.
#Calcium_and_sulfur; Calcium is important in cell wall development, provides resistance against diseases and helps in roots elongation. Sulfur is part of many amino acids, so these are also very important nutrients to be provided for better growth. Applying 5 bags of gypsum add these nutrients to good quantity.
#Fertilizer_Plan;
During soil preparation add half or full bag of MOP/SOP. If potassium level is higher than 300 ppm in soil then half bag otherwise ful bag of potash. Add 25kg DAP or 50kg SSP+10kg urea. Also add 5 bags gypsum/acre.
After 15 days of nursery transplant give 12kg DAP + 25kg urea and 10kg sulphuric acid.
After 20 days give foliar application of 250grams zinc and 200 grams boron/100 litre water.
After 30 days give 25kg urea.
After 45 days give 12kg DAP + 25kg CAN (nitrate nitrogen is safe to use at this stage, because it is quickly absorbed by fast growing rice plants before it gets denitrify. Experiments show better response for ammonium nitrate at this stage). Also give foliar application of zinc and boron, add 1kg potassium nitrate in it. This will help crop to stand against strong winds.
After 60 days add 25 kg CAN and give foliar application of potassium nitrate, 1kg/100 litre water.
#Other_Practices; During nursery transplant dip roots of nursery in phosphorus solubilizing bacteria solution for 10 seconds. It will boost phosphorus absorption from soil.
For 1st 20 days always keep field flooded with sufficient water, it will help alot to stop weeds germination. Crop will remain weeds free by this practice.
Regards; Muhammad Majid Saleem
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