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ORGANIC RICE BYV.HARIHARASUDHANBSA-06-627. what is organic rice?  Organic rice is grown using natural and not chemical fertilizers, which are harmful.

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Presentation on theme: "ORGANIC RICE BYV.HARIHARASUDHANBSA-06-627. what is organic rice?  Organic rice is grown using natural and not chemical fertilizers, which are harmful."— Presentation transcript:


2 what is organic rice?  Organic rice is grown using natural and not chemical fertilizers, which are harmful to health and environment as well.  However, producing organic rice is much more than just using natural or organic fertilizers.

3 What are the benefits of organic rice?  Free from chemical,  organic rice is fat free and has high carbohydrate content.  Red and brown rice have higher fiber value than white rice.  Organic rice has low sugar content  When you eat 45 grams of organic rice, you only consume 160 calories of carbohydrates.

4 Organic Rice production  Organic systems avoid the use of synthetic fertilizers, pesticides, and growth regulators.  Instead they rely on crop rotations,,  biological pest control  maintain soil health,  supply plant nutrients,  minimize insects, weeds, and other pests.

5 Weed Suppression  Weed control and soil fertility are the principal challenges associated with organic rice production.  primary weed-control practices include crop rotations, land leveling,seedbed preparation,  water management,  rotary hoeing.

6 Soil Fertility  Maintaining soil fertility in organic cropping typically involves some combination of crop rotation with deep-rooted legume crops or green manure/cover crops,  applying animal manures, composts, and other approved organic amendments.  Nitrogen is usually provided through thegrowing of legume cover crops.  Bone meal is a good source of cheap phosphorus (with a content of around 12%).  Rice straw and manure are good sources of potassium

7 Organic manure  Organic Manures obtained either from cattle or plants.  Use of organic manures by farmers is an age-old practice in agriculture.  Organic manure's – maintains better structure of soil

8 Geen leaf manure (mainly neem, Pongamia pinnata and Glyricidia) (mainly neem, Pongamia pinnata and Glyricidia) Green manure (daincha, manila agathi,sunhemp) (daincha, manila agathi,sunhemp)

9 Insects and Diseases management  Rice is grown in flooded fields, insect pests are usually a minor problem  Fall armyworm and chinchbug are easily controlled by a flush of water  Timely planting, variety selection, and cultural practices to suppress weeds control stinkbugs and water weevils

10 Biofertilizers for rice cultivation  Bio-fertilizer are eco friendly and are environmentally safe.  Biofertilizers are widely used in rice production.  The biofertilizers used for rice crop are Azospirillum, Phosphobacteria, Blue green algae azolla and Mycorhiza.

11 Methods of application of biofertilizers  Azospirillum: is a symbiotic bacteria and it is an important biofertilizers used in rice. Azospirillum treatment is recommended for seed, seedlings and in main field.  Seed treatment: 600 glha of Azospirillum culture are to be mixed with water where the seeds are soaked one night before sowing in the nursery bed.

12 Main field:  2000 glha of Azospirillum with 25 kg farmyard mamure and 25 kg of soil are mixed uniformly and broadcasted in the main field before transplanting. Seedling treatment:  A slurry can be prepared by mixing Azospirillum at 1000 glha in 40 litres of water and root portion of transplanted rice seedlings are dipped in bacterial suspension for 15- 30 minutes and then they are transplanted.

13 Uses  Azospirillum bacteria thrives in root zones of rice and is capable of fixing more atmospheric nitrogen which is absorbed by the plants.  Azospirillum also solubilizes phosphorus and silicon to some extent required by rice.  It renders plant drought tolerant when irrigation or rainfall is delayed.  By adopting Azospirillum application 30 per cent of the inorganic nitrogen usage can be reduced.

14 Blue Green Algae (BGA)  Blue Green Algae (BGA) is another type of biofertilizer used as an alga form. Important species are Cyanobacteria, Anabaena, Nostoc and Tolypothrix.  Blue green algal occurs naturally and comes up well under moist conditions. This can also be artifially cultured.

15 Uses  The nitrogen fixed by BGA is about 15 kg/ha over a season.  BGA elaborates vitamin Biz and growth factors that makes the plant grow vigorously.  It oxygenates the water impounded in the field.  It excretes organic acids that renders phosphorus solubilisation.  The algal mat in paddy fields also protects loss of moisture from the soil.

16 Azolla  Azolla is a water fern having an algal symbiont Anabaena azolla fixing atmospheric nitrogen.  Azolla can be multiplied by constructing nurseries with 10 cm deep standing water and adding superhphosphate at 8 kg P2o5/ha in small plots.  It can be applied as green manure prior to rice planting

17 Uses  Azolla excretes organic nitrogen in water during its growth and also immediately upon trampling.  Fern fronds are soft and rapidly decomposed.  It absorbs traces of potassium from irrigation water.  Azolla provides nitrogen, potassium organic carbon etc.  It prevents weed growth in rice field water.

18 Phosphobacteria  This type of biofertilizers solubilise phosphates in the soil and render them in available form for crop plants. It can be applied for low land and upland rice.  This is applied as the same dose in same manner as Azospirillum.

19 Uses  25 to 50 of the recommended Phosphorus can be reduced depending upon the native phosphorus content of the soil.

20 Mycorrhiza:  It occurs naturally in low land and upland rice. It mobilizes the phosphorus required by rice. Mycorrhiza inoculation attempt in paddy nursery is still under study by Agricultural Universities of India.  Since, biofertilizers are ecofriendly inputs and are safer to the environment, farmers can adopt them and get benefited.


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