maize crop disorders a lecture by mr allah dad khan
TRANSCRIPT
Nutrient Deficiency and Physiological Disorders in Maize
ByMr. Allah Dad Khan
Nitrogen deficiency
Symptoms• Pale green plants; chlorosis
or necrosis advance from the leaf tip along the midrib
Nitrogen deficiency
Nitrogen deficiency
Phosphorus deficiency
Symptoms• Dark green plants; dark
yellow chlorosis advancing alon#DDFFDDpurple color
Phosphorus deficiencySevere phosphorus deficiency in corn plants.
Phosphorus deficiency
Potassium deficiency
Symptoms• Dark green plants with
chlorosis along the leaf margins developing to brown striping and necrosis
Potassium deficiency
Potassium deficiency
Potassium deficiency
Potassium deficiency
Potassium deficiency
Potassium deficiency
Potassium deficiency
Potassium deficiency
Calcium Deficiency
Symptoms• Calcium (Ca) is used by plants to
form sturdy cell walls and functions in N uptake, for proper enzyme activities, and for flowering and reproduction. Soil Calcium has a rôle in buffering pH to ensure other nutrients, especially trace elements, are to the plant in a “balanced diet”. It plays a major role in improving soil structure and drainag
Magnesium deficiency
Symptoms• Green-yellow plants with
dark yellow interveinal chlorosis advancing to rust-brown necrosis
Magnesium deficiency
Magnesium
Copper Deficiency
Symptoms• Copper (Cu) and Boron (B). These
have vital roles in plant growth and function, and can become deficient in soil due to pH problems, or to mere depletion by growing crop after crop without soil testing. Soil and plant tissue testing are vitally important for these trace elements because they are normally present in such small amounts in the soil, problems can arise quickly during rapidly growing crops such as corn.
Copper Deficiency
Iron deficiency
Symptoms• Symptoms are prominent
interveinal chlorosis or necrosis; veins are prominent over length of leaf
Manganese Deficiency
Sulfur deficiency
Symptoms• Pale yellow plants;
uniformly yellow leaves without necrosis
Sulfur deficiency
Sulfur deficiency
Sulfur deficiency
Sulfur deficiency
Zinc deficiency
Symptoms• Pale green plants; white to
pale yellow bands in the lower half of the leaf which advance to pale brown or gray necrosis
Zinc deficiency
Symptoms
Zinc deficiency
Symptoms
Zinc deficiency
Symptoms
Zinc deficiency
Zinc deficiency
Boron Deficiency
Boron Deficiency
Drought damage to corn plants.
Symptoms • Weather is also a determining factor. Too
much, or more commonly lately, too little rain can reduce growth and nutrient uptake, exposing the plants to greater disease and insect pressures. Drought has taken a terrible toll on corn crops in the past few of years. Maintaining good nutrition will help minimize losses due to drought, but water is always the most crucial factor. Plant water uptake is the main path by which nutrients are taken up, if water is in deficit, or if it is of low quality, i.e. salty irrigation water, nutrient uptake will be affected, causing several related nutrient and soil problem
Nitrogen fertilizer burn seen in corn plant.
Symptoms• Water shortage can also
lead to fertilizer burn when fertilizer salts cannot be dispersed sufficiently and moved away from plants roots. This concentrates the fertilizer salts around the roots and results in burning.