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Determination of optimum phosphorous level for grain sorghum using external and internal response indicators in rainfed semiarid tropical alfisol

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Title Determination of optimum phosphorous level for grain sorghum using external and internal response indicators in rainfed semiarid tropical alfisol
Determination of optimum phosphorous level for grain sorghum using external and internal response indicators in rainfed semiarid tropical alfisol
 
Creator ICAR_CRIDA
 
Subject P use efficiency, agronomic P efficiency, optimum P level, P uptake, P harvest index, balance, prediction functions, India
 
Description Not Available
The productivity of sorghum, an important staple food crops in semi-arid tropics of the world, is
low due to scarcity of moisture and poor soil fertility. Response of crops to phosphorus (P) application
in these soils is erratic and tricky, which depends upon the available P status in soils, distribution
of rainfall, adsorption and desorption capacity of soil, and overall P sink created by crop depending
upon its vigor. Delineation of optimum P level for higher productivity and to avoid wastage of
precious P fertilizer thus becomes inevitable. Hence, an experiment was conducted at Hayathnagar
Research Farm of Central Research Institute for Dryland Agriculture, Hyderabad to (i) study the
external (relative grain yields, agronomic efficiency, harvest index) and internal response (fertilizer
P use efficiency, P uptake harvest index) indicators of sorghum to various levels of P application,
(ii) development of prediction functions to arrive at optimum P dose and (iii) P use - removal balance
for grain sorghum for these rainfed semi-arid tropical Alfisols. Results of the study indicated that
P application to sorghum in these Alfisol soils beyond 23 kg ha−1 might not be much economical
and desirable. It was observed that the maximum grain yield of 87% could be achieved at a leaf
P concentration of 0.39% at boot leaf or flag leaf stage and 0.30% at 50% flowering stage. The
prediction functions were developed to understand the quantitative relationship between external
and internal response indicators. The zero P balance (neither depletion nor excessive build up)
obtained at 20 kg ha−1 level (per se near 23 kg P ha−1) indicates that this level is sufficient for
sorghum crop to perform with an agronomic efficiency of 19.42 kg grain kg−1 P. The findings of
this study would help in efficient use of P fertilizer for achieving desirable yield levels and will in
turn reduce the expenditure on P fertilizers that are mostly imported by India and majority of other
developing countries.
Not Available
 
Date 2022-01-27T04:36:36Z
2022-01-27T04:36:36Z
2012
 
Type Technical Report
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/68958
 
Language English
 
Relation Not Available;
 
Publisher Sharma KL,