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POTASSIUM STATUS OF CAULIFLOWER (Brassica oleracea var. Botrytis) GROWING SOILS OF RANGAREDDY DISTRICT IN RELATION TO THE SHORT TERM AND LONG TERM AVAILABILITY

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Title POTASSIUM STATUS OF CAULIFLOWER (Brassica oleracea var. Botrytis) GROWING SOILS OF RANGAREDDY DISTRICT IN RELATION TO THE SHORT TERM AND LONG TERM AVAILABILITY
 
Creator KALYANI, K.
 
Contributor SAILAJA, V.
 
Subject livestock, mastitis, biological phenomena, animal husbandry, bacteria, genes, economic systems, amino acids, proteins, genotypes
 
Description Potassium, an essential plant nutrient with diverse role to play in plant metabolism
is required in large amounts by most crops. Although most soils contain large amounts of
K, many times the soil fails to supply adequate amounts of the nutrient to meet the normal
needs of the plants and responses were observed to its application. Keeping this in view an
investigation was carried out on the “Potassium status of cauliflower (Brassica oleracea
var. Botrytis) growing soils of Rangareddy district” to study extensively various aspects of
K nutrition of cauliflower. Surface soils in bulk were collected from thirty locations of
Rangareddy district and pot culture experiment was carried out. The soils were analysed
for their salient characteristics besides conducting incubation studies under laboratory
conditions to understand the release pattern of K from soils. Inorganic K fractions were
analysed to evaluate the relative efficiency of extractants in determining the available K.
The soils under study are light textured, slightly acidic to slightly alkaline and non
saline. The cation exchange capacity of the soils was in the range of 14.39 to 20.02 c mol
(p+) kg-1. The soils were low in organic carbon content ranging from 0.11 to 0.65 per cent,
with low to medium available N content of 231.1 to 306.5 kg ha-1, low to medium P2O5 of
10.2 to 48.43 kg ha-1 and medium to high in K2O of 121.5 kg ha-1 to 542.9 kg ha-1.
The level of extraction of K by different extractants followed the order : Boiling
HNO3 (1 M) > NaBPh4 (0.2 M ) > Citric acid (0.01 M) > NH4OAc (NN) > Oxalic acid
(0.01 M) > Acetic acid (0.01 M). Among all the inorganic K-fractions, boiling HNO3
(1 M ) extracted higher amounts of K ranged from 654 mg kg-1 to 1794 mg kg-1 with a
mean of 1407 mg kg-1.
The contents of KL (quantity factor) ranged from 0.07 to 1.21 (Mean of 0.382). The
ARe
K (intensity factor) showed a range of 0.11 to 17.1 (ML-1)1/2 × 10-3 with a mean of
3.304 (ML-1)1/2 × 10-3. The PBCK (c mol (P+) kg-1/(ML-1)1/2 × 10-3) ranged from 0.025 to
5.727 with a mean value of 0.45.
The release of K was significantly increased from 15 DAI the highest K release was
obtained at 60 DAI then it was declined at 90 and 120 DAI.
The mean curd yield was 352.4 g plant-1 in the control which showed a significant
increase to 454.8 g plant-1 with the application of 150 kg K2O ha-1. The response to the
applied K in terms of curd yield was only 12.2 per cent on Mominpet soil with high native
K fertility, where as it was 52.5 per cent with Emamguda soil with low available K. The
mean response to the application of K was 25.28 kg cauliflower curd per kg of potassium
applied. The mean K uptake was 0.52 g plant-1 in the control which significantly increased
to 1.01 g plant-1 with the application of 150 kg K2O ha-1. Application of 150 kg K2O ha-1
resulted in 59 per cent increase in the NH4OAc extractable K as against control. Among all
the extractants 1N NH4OAc extractable K showed higher positive correlation with curd
yield (r = 0.975**). It had a significant positive correlation with NaBPh4 (0.2 M)
extractable K (r = 0.926**). The critical limits of available K for cauliflower growing soils
of Rangareddy district were found to be 120.8 and 334.2 ppm respectively for NH4OAc
(N N) and NaBPh4 (0.2 M). The critical plant K content of cauliflower was found to be 2.6
per cent.
 
Date 2016-05-31T12:28:15Z
2016-05-31T12:28:15Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66480
 
Language en
 
Relation D8908;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY