The rainfed rice crop is cultivated in rainfed uplands to an extent of 1/6 of total rice area in the State. The growing period in this situation is 115-120 days and in general, the productivity levels are lower. Rice varieties like Jyoti and Annada is predominantly cultivated in these situations.
Prepare the field by ploughing and cross-ploughing early in the season so that the field is ready for sowing before the regular onset of monsoon. Allow the weeds seeds to germinate. Adopt shallow harrowing to kill the weeds that emerge. Later on, level the field before sowing.
Varieties with duration up to 120 days (from seed to seed) can be grown.
Annada: White kemelled, bold seeded high yielding (4.2 mt 1ha) with a duration of 110 – 115 days.
Revathy (MO-17): Red kemelled, bold seeded, with yield potential of 4.5 mt/ha.
Karjat-3: White kemelled, short bold grain, good for parboiling as well as raw rice, good head rice recovery with yield potential of at least 5 mt / ha.
Dry the soaked seed for 24 hours in shade for inducing stress in the plant. Treat the seed with Carbendazim (Bavistin, Topsin, etc.,) @ 2 g per kg of seed so as to get uniform seed coating (Preferably using seed drum).
About 60-80 kg for drilling and 100-120 kg for broadcasting.
Time of Sowing
June 1st fortnight with the regular onset of the monsoon.
Sowing / Planting Method
Sow the seed behind the country plough in shallow furrows, 2-3 cm deep at 20 cm apart to ensure better germination. Thin out and simultaneously fill the gaps, 10-12 days after germination to ensure optimum plant population. Pre-germinated seed can be broadcasted on a levelled surface with a thin film of water or sown through plough sole placement. Under transplanted situations, maintain a plant population of 50-60 hills / m2 by uniform planting in lines spaced at 20 cm apart.
Manures and fertilizers
FYM @ 10 mt/ha or any other available organic/green manure can be used. Incorporate 2-3 weeks before sowing. Apply Rock Phosphate @ 45 kg/ha at least one week before sowing both as a source of phosphorus and as a soil conditioner.
80:50:50 kg NPK / ha. Apply all phosphate (P 205)’ 50% nitrogen (N) and potash (K20), as basal dose
at the time of sowing or transplanting. After 25-30 days, apply 25% nitrogen as first top dressing. In another 20-25 days, apply balance 25% nitrogen and 50% potash as second top dressing. Weed the field and drain water wherever possible before top dressing. Type of fertilizer and its quantity can be chosen from any of the combination given below. Use of a combination of straight fertilizers is economical with better crop response.
Weed infestation is a chronic problem in rice cultivation. The loss caused by weeds ranges from 30-40% including quality deterioration of the grain. The first 35-40 days of the crop is the critical period for weed competition. The weeds can be effectively controlled by using Cono weeder (low cost manually operated intercultural implement) in line sown crops with the availability of thin film of water in the field.
Granular herbicide formulations like Butachlor 5 G @ 20 kg/ha or Benthiocarb 20 G can be mixed with water and blanket spray using high volume sprayer within three days of sowing is recommended. Granular herbicides are convenient to apply as it eliminates the use of a spray pump.
Alternatively, the selective herbicides like Benthiocarb 50 EC @ 3.0 litres / ha or Butachlor 50 EC @ 3.0 litres/ha or Pendimethalin 30 EC @ 3.0 litres/ha or Anilophos 30 EC @ 1.0 litre / ha can be used. Benthiocarb is preferred as besides killing germinating weed seeds, it also has a post-emergent effect on weeds up to 1-2 leaf stage.
Alternatively, mix the above formulation with 80-90 kg of fine sand and broadcast evenly in the field. For use of granular herbicides application, drain the water from the field
- Central Coastal Agricultural Research Institute, Ela, Old Goa, Goa