introduction: rice crop needs seventeen essential nutrients. out of these nitrogen, phosphorus,...
TRANSCRIPT
Introduction:
• Rice crop needs seventeen essential nutrients. Out of these
Nitrogen, Phosphorus, Potassium, Iron, Manganese, Zinc and
Copper are considered important in rice nursery.
• These nutrients are supplied to rice crop through the soil in the form
of fertilizers and manures. Providing sufficient amount of nutrients
at appropriate time using appropriate method is a crucial factor in
rice nursery management.
• Nutrients should be supplied considering the rice variety, soil and
agro-climatic factors. Knowledge of common visual deficiency
symptoms is also essential for proper nutrient management in rice.
Visible deficiency symptoms of various
nutrients in rice crop are:
A. Nitrogen
1.Older leaves become orange yellow
and die from the tip downwards.
2.The new leaves are thin, short and
stiff. Roots are few in number, thin and
elongated.
3.Nitrogen deficiency reduces the plant
height and number of tillers.
Deficiency Symptoms of Nitrogen in Rice Crop
Nutrient Deficiency Symptoms in Rice
B. Phosphorus.
1.Plant growth is stunted and roots are thin,
long and brown in color.
2.Older leaves turn purple and pinkish
spots are observed on stem.
C. Potassium
1.Plant is short and droopy and leaf tips
and margins are scorched and wavy.
2.Upper leaves turn dark green and
develop dark brown spots.
3.Interveinal chlorosis is observed on
middle leaves.
Deficiency Symptoms Of Phosphorus
Nutrient Deficiency Symptoms in Rice
Deficiency Symptoms Of Potassium
D. Iron:
1.Deficiency symptoms first appear on second leaf, 7 to 10 days
after germination.
2.Young leaves appear chlorotic and wither off. Interveinal chlorosis
appears. If deficiency is prolonged the leaf apex dies.
Deficiency Symptoms Of Iron
Nutrient Deficiency Symptoms in Rice
Nutrient Deficiency Symptoms in Rice
E. Manganese
1.Deficiency appears in seedlings at 3 leaf
stage. Where chlorotic yellow colored
spots)occurs.
2.A patch of green and chlorotic cells appear
away from third leaf base. Apex and margin
of affected leaves wither and dry off.
3.In prolonged deficiency, patches increase
in number and size, forming large irregular
lesions and chlorotic stripping.
Deficiency Symptoms of Manganese
D.
F. Zinc
1.Zinc deficiency in rice is more serious
in low lying fields with high water table in
rainy season. Nursery should be avoided
in such areas.
2.Older leaves become reddish brown
and roots become brown and sparse.
Base of growing leaves become
chlorotic.
3.Scattered brown spots are seen which
extend over whole leaf lamina.
Deficiency Symptoms of Zinc
Nutrient Deficiency Symptoms in Rice
G. Copper:
1. Leaves become chlorotic near the tip. Chlorosis extends
downward along both sides of mid-rib, followed by dark brown
necrosis of the leaf tip. The new leaves remain rolled and appear
needle shaped.
Deficiency Symptoms Of Copper
Nutrient Deficiency Symptoms in Rice
A. Modified Mat Nursery:
1.Modified mat nursery needs 4 cubic meter soil mixture for every 100
square meter nursery area.
2.Soil Mixture consists of 7 parts of soil and 2 parts well decomposed
chicken manure and 1 part of fresh or charred rice hull.
3.Lack of nitrogen is indicated by yellowing of seedling after 7 days
which can be corrected by spraying 0.5 % urea solution.
Fertilizer Application in Different Nurseries
B . Dapog Nursery
1.100 m2 nursery should be applied 0.5 to 1 kg of nitrogen, 0.5 kg
phosphorous and 0.5 kg of potash fertilizers.
2.FYM must be applied @ 250 kg/100 m2 area during bed preparation.
C. Dry and Wet Bed Nursery
1.Apply FYM @ 2 kg/m2 nursery bed area before bed preparation.
2.In less fertile soils, a basal application of 0.05 kg DAP/m2 nursery bed
is used. DAP application 15 days after sowing is recommended for
good growth and easy uprooting on 25 days.
Fertilizer application in different types of nursery