Raising of Seeds in the Nursery/ Field
|Preparation of nursery||
Rice can be either transplanted or sown
directly in the field. When the farmer decides for transplanting, preparation
of nursery is the first step. Basically, three methods of nursery
preparation can be adopted. The choice primarily depends on the availability
The wet method can be adopted in areas where
water is available as in the second crop season. Seedlings raised by the wet
bed method can be harvested one week earlier. The seedbed should be prepared
in advance, so that the pre-germinated seeds can be sown in time. As far as
possible, fertile lands with irrigation and drainage facilities should be
selected for raising the nurseries. Such lands should be suitably located to
receive full sunlight. The following are the steps in raising wet nursery.
Plough and harrow the fields two or three times until the soil is thoroughly puddled and levelled. Prepare raised beds 5 to 10 cm high 1 to 1.5 m wide and of convenient length with drainage channels between the beds. The total seedbed area should be 1000 m2 for each hectare of the field to be transplanted.
Apply compost or cattle manure @ 1 kg per m2 of the nursery bed and mix well with the soil at the time of preparation of the field.
Treat the seeds by wet method. Drain and incubate in warm moist place for sprouting. Never allow the seeds to dry up. Moisten them occasionally. Sow germinated seeds on the third day. Delay will result in poor seedling stand.
Irrigation may be commenced on the 5th day after sowing and continued up to the 7th, to a depth of about 5 cm. After this period, irrigate the seedbed continuously to a depth of about 5 cm in order to control weeds.
Drain occasionally to encourage production of vigorous seedlings with short roots. Flooding the soil with too much water for long periods produces tall and weak seedlings, which do not readily recover during transplanting.
If symptoms of nitrogen deficiency are observed, broadcast urea at the rate of 1 kg for 100 m2 as top dressing about 10 days prior to pulling out of seedlings, depending upon the duration of variety.
This method is practiced in areas where
sufficient water is not available and the time of planting is uncertain.
During first crop season, wherever transplanting is done depending upon
receipt of rainfall, it is safer to adopt this method since growth of the
seedlings can be controlled.
Plough the nursery area to a fine tilth. Prepare raised beds of 1 to 1.5 m width, 15 cm in height and of convenient length. Apply compost or cattle manure at the rate of 1 kg/m2 of the nursery bed and mix well with the soil at the time of preparation of the field.
Sow the seeds treated as described under dry seed treatment method, evenly over the bed and cover with fine sand / soil.
Water the nursery as and when required depending upon the receipt of rains.
Note: Rice seedlings from solarised nursery beds showed high initial growth, early maturity and resistance to leaf blast disease (ad hoc recommendation).
"Dapog" method, otherwise called
"soil less nursery" is a method adopted from Philippines. The essential feature of this method is to have a very thick
stand of the nursery seedlings without any contact with the soil. Generally,
seedlings become ready for transplanting in 12 to 14 days. The method of
preparation of dapog nursery is as follows.
|References||Kerala Agricultural University. 2011. Package of Practices Recommendations: Crops.14th edition. Kerala Agricultural University, Thrissur- 360 p.|