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Question : Tip burning in paddy leaves at 15 - 20 days after transplanting is being noticed ? What may be the reason?
Answer :

It may be due to attack of Thrips or scorching effect of fertilizers / Weedicides. Need to be verified with specimen.

 

Question : There is Yellowing patches in paddy field? What may be the reason?
Answer :

This may be due to 3 reasons viz., Blast, BPH and Zn deficiency. If it is Blast, plants will show diamond shaped necrotic spot on leaves. For controlling the blast disease spray Carbendazim at the rate of 1 g / lit of water.

If this symptom is not there look at the base portion of plants for congregation of BPH and gently tap the plants and observe for BPH falling in the water and jump off , it is a clear-cut indication of BPH / WBPH. For controlling the BPH follow the recommended IPM practices.

If this insect is not observed and leaves with slight yellowing in symptoms with coppery specks it is due to Zn deficiency. For controlling Zn deficiency spray ZnSo4 @ 0.5 -1.0 %.

Question : Name the type of biofertilizers used in paddy cultivation and methods of application ?
Answer :

Biofertilizers are the microbial inoculants used to enrich the soil fertility by fixing the atmospheric Nitrogen. Following biofertilizers are commonly used under puddled condition in transplanted paddy.

> Azospirillum / Azotobacter.

> P solubilising bacteria.

Question : How much of FYM / Organic manure has to be applied for transplanted paddy?
Answer :

10 tons well decomposed FYM or Compost / ha or 5 tons of green leaf materials (Diancha / Sunnhemp) are acts as a very good source of Organic manure in transplanted paddy.

Question : What is the dose, time and method of application of fertilizers in paddy?
Answer :

General recommendation of fertilizers for paddy cultivation is 100:50:50 NPK Kg/ha and 20 Kg of ZnSo4/ ha. Dosage: 50 % N, K and 100 % P at the time of transplanting 25 % N at the 25 - 30 days after transplanting; 25 % N and 50 % K Panicle initiation stage (60 days after transplanting).

Question : What are the important agronomic practices to be followed to attain high productivity under saline/ alkaline soils?
Answer :

To attain higher productivity in saline/alkaline soils, use seedlings of 30-35 days old, more no of seedlings per hill, apply 50 % extra FYM, 25 % more nitrogen and double the dose of ZnSo4.

Question : How to manage saline soil in paddy fields?
Answer :

In paddy fields saline / alkaline soils can be managed by providing proper drainage, application of FYM at the rate of 15 - 20 tons/ha. Growing of green manuring crops.

 

Question : How much fertilizer we have to use for cultivation of hybrid rice varieties?
Answer :

Hybrid rice varieties require separate fertilizer package. They are very well responding to nutrient application and separate package of practices for hybrids need to be followed. We need to apply NPK @ 50:25:25 kg/acre. 

 

Question : Will there be any depletion of soil nutrients, if hybrids are grown continuously ?
Answer :

Though no systematic studies have been done so far, the indications are that there will not be any depletion of soil nutrients, if hybrids are grown continuously. Hybrids are high nutrient use efficient. The same dose of fertilizers applied to hybrids is utilized much more efficiently by the hybrids in giving the higher yields.

Question : Is there any difference in fertilizer schedule in hybrids as compared to the varieties ?
Answer :

Yes, For hybrid rice cultivation, it is recommended to apply nitrogen in four splits as basal, at active tillering, at panicle initiation and at heading stage as compared to two/three splits recommended for high yielding varieties of similar duration. The fourth split is recommended for hybrids as the sink size is larger due to higher number of spikelets per panicle. Similarly, potassic fertilizer is recommended for application in two splits as basal and at maximum tillering .

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