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Question : What are the remedial measures for zinc deficiency in rice ?
Answer :

Deficiency of Zn is generally encountered in soil with coarse texture, low in organic matter, high in pH and calcium carbonate content. To control the Zn deficiency in rice 25 kg of zinc sulphate per hectare is recommended at last puddling. Where Zn deficiency is noticed in the growing crop, apply this quantity of zinc sulphate as soon as possible. Always prefer to apply zinc sulphate through soil application rather than foliar spray to utilize its residual effect for the subsequent crop.

 

Question : What are the remedial measures for chlorosis (iron deficiency) in rice ?
Answer :

Spray the crop with 1.0 per cent ferrous sulphate solution (1kg ferrous sulphate in 100 lt. of water) at weekly interval. Besides this, frequent heavy irrigation should be given to ensure ponding of water in the rice field. Green manuring with Sesbania aculaeta (Dhaincha) also helps in reducing the occurrence of iron deficiency in coarse textured soil.

Question : What are the suitable sources and optimum time of N, P, K and Zn in rice ?
Answer :

Apply recommended dose of fertilizers (125 kg N + 30 kg P2O5+ 30 kg K2O/ha). Apply 1/3 nitrogen, whole of the phosphorus and potassium before the last puddling. Broadcast the remaining nitrogen in two equal splits, one 3 weeks after transplanting and the other six weeks after transplanting. Skip phosphorus application to rice if recommended dose of phosphorus has been applied to the preceding wheat crop. It is also advisable to drain off water from field before Urea application. Water level upto 2-5 cm should be maintained 3 days after application of fertilizer. To avoid excess N application, use Leaf colour chart as per the guidelines given in the package of practices.

Question : How to corect iron deficiency in rice?
Answer :

Spray 5-10% ferrous sulphate solution mixed with lime twice at 3days interval.

Question : How to control zinc deficiency in rice?
Answer :

Zinc deficiency occurs in saline, levelled soils, water stagnated conditions, low nitrogen with high corboncontained soils where huge quantities of organic manures are used and also more phosphatic fertlisers used soils. Zinc deficiency occurs 2-6weeks after transplantation. Apply 50kg/ha.zinc sulphate at last puddling. If soil soil application has not been done spray 0.2% (2g per liter of water) zinc sulphate solution 2-3 times at 3days interval.

Question : Can we use vermicompost to rice crop? How much quantity?
Answer :

Vermicompost can be used to rice crop (5t/ha.) but it is not economical.

Question : What type of fertilizers are recommended to rice crop? Can we use poultry manures?
Answer :

Poultry manure can be used to rice crop up to 4-5 tonnes per ha. 12-15days before transplantation. All types of organic manures and biofertilisers (FYM,, compost, residues of crops,plant and industrial waste, azolla, Blue green algae)can be used.

Question : When the applied phosphorous wis utilized by the plants? How long the applied P will be available to rice plants?
Answer :

Phosphorous is slowly absorbed by tbe rice plant roots and is used for root growth. Phosphorus is more used in the first 20days for root penetration and growth. 20-25% of applied p alone will be utilized and the rest is fixed in the soil and will be available to the subsequent 3-4 crops in small quantities.

Question : When to apply potash fertilizers ?
Answer :

In black and heavy soils, apply entire potash as basal. In light soils, apply before transplanting and second time at time of panicle initiation.

Question : When to apply phosphatic fertilizers?
Answer :

Apply entire phosphatic fertilizer at the time of pudling as basal. Do not apply as a top dress. Use in the form of single super phosphate for better utilization.

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