POTASSIUM NUTRITION OF SORGHUM ( Sorghum bicolor ( L. ) Moench ) UNDER RAINFED CONDITIONS
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Date
1989
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ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
Abstract
The experiment was conducted in the rainy season 1988
(June-October) with two sorghum cultivars viz., SPV-462
and CSH-5 and four potash levels; 0, 20, 40 and 60 kg ha -1 .
The objectives of the investigation were to study the response
of sorghum cultivars to potash application and to
fix optimum dose of potash under rainfed conditions. Data
at fortnightly intervals were collected during the crop
season. The data on various growth parameters like plant
height, number of leaves, leaf area index, dry weight of
plant parts, dry matter partitioning and days taken for
50% flowering showed that potash at 40 kg ha-l was beneficial.
Various biochemical parameters such as N, P and K uptake
and chlorophyll content of the leaves were also improved
by the added potassium. Application of potassium to
sorghum was found to be beneficial for increasing grain
yield. Singificant increase in grain yield was recorded
with the application of 40 kg K20 ha -1 (5692 kg ha - 1 ) as
against 4383 kg ha -1 recorded by control treatment, the
increase being 30 per cent. This increase in yield was
due to the increase in yield contributing parameters like
number of primary and secondary rachii per earhead, number
of grains -1 earhead , 1000 grain weight, LA!, CGR, NAR,
HI, uptake of N, P and K and improved chlorophyll content.
Out of the two cultivars, cv. SPV-462 was found to
be superior over cv. CSH-5 for many of the characters with
added potassium while the hybrid cv. CHS-5 was superior
over cv. SPV-462 in respect of harvest index. It is evident
that the application of 40 kg K2o ha-ยท 1 is beneficial under
rainfed situations.
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Keywords
POTASSIUM, NUTRITION, SORGHUM, ,Sorghum, bicolor, Moench,