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Status and Requirement of Boron for Tropical Tuber Crops Under Laterite (Typic Kandi Ustult) Soils

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Title Status and Requirement of Boron for Tropical Tuber Crops Under Laterite (Typic Kandi Ustult) Soils
Not Available
 
Creator K. Susan John, D. Karthika, T. Sruthi, J. Sreekumar, K. Sunil Kumar and P. S. Anju
 
Subject Laterite, available B, exchangeable Ca, sorption curve, inverse prediction function, yams, hollow/ brown heart, abiotic stress
 
Description Not Available
Tropical tuber crops also require the micronutrient B for its growth and productivity as in the case of all
other crops. The very low B content in the major tropical tuber crops growing soils of Kerala could
cause the manifestation of B deficiency symptoms both in vegetative parts and tubers in the case of
cassava and sweet potato. The recent occurrence of symptoms akin to hollow/brown heart of potato,
in yams (Dioscorea), necessitated to take up experiments related to B nutrition to understand the
etiology of this problem. Since the manifestation was noticed in a typical laterite soil (Typic Kandi
Ustult) of the farm of ICAR-CTCRI and under similar soils of the State, a rapid nutrient status appraisal
was made for the five blocks of CTCRI farm for nutrients viz., available B and exchangeable Ca as
there exists a synergism between these two nutrients. A sorption study too was conducted to predict
the rate of application of B for soils of varying B status. A total of 95 soil samples collected from these
blocks taking into account the terrain and present cropping/fallow were analysed. Wide variation was
seen in the available B status ranging from 0.14-0.419 ppm for block I and II, 0.172-0.419, 0.172-
0.848, 0.150-1.052 ppm for block III, IV and V respectively with mean values as 0.317, 0.242,
0.289, 0.331 and 0.356 ppm respectively. The mean exchangeable Ca content of the soils of these
blocks were 0.896, 1.015, 0.640, 0.989, 0.877 meq 100 g-1 soil with ranges as 0.565-1.303,
0.741-1.387, 0.534-0.866, 0.762-1.215 and 0.591-1.254 meq 100 g-1 soil respectively. To
understand the interaction between these nutrients, the correlation worked out indicated synergism
or significant positive correlation (r=0.537) only in block V. Sorption study could find a linear increase
in the quantity of B extracted in the soils of varying B contents ranging from 0.1-1.0 ppm under
addition of incremental rates of B from 0.25 to 4.0 ppm. The inverse prediction function method
employed to predict the quantity of B to be applied to attain soil B status to either the soil critical level
of B (0.5 ppm), double (1.0 ppm) and thrice (1.5 ppm) the critical levels in soils of the above B status
(0.1-1.0 ppm) was found as 0.78-3.09, 1.80-7.21 and 7.4-11.33 ppm respectively. Though the low
soil available B and exchangeable Ca content can be attributed as one of the reasons for the problem
manifested in yams, detailed studies are needed to explore the role of abiotic factors especially
moisture and heat stress in the dynamics of these nutrients at different growth stages of the crop.
Not Available
 
Date 2021-08-06T04:01:33Z
2021-08-06T04:01:33Z
2020-06-01
 
Type Article
 
Identifier Not Available
0378-2409
http://krishi.icar.gov.in/jspui/handle/123456789/53318
 
Language English
 
Relation Not Available;
 
Publisher Indian Society for Root Crops