Record Details

PHOSPHORUS UTILIZATION BY INDIAN SPINACH (Beta vulgaris var. benghalensis Hort.)

KrishiKosh

View Archive Info
 
 
Field Value
 
Title PHOSPHORUS UTILIZATION BY INDIAN SPINACH (Beta vulgaris var. benghalensis Hort.)
 
Creator SRIKANTHA RAO, P.V
 
Contributor ARUN SATHE
 
Subject PHOSPHORUS, UTILIZATION, INDIAN, SPINACH,
 
Description A pot culture experiment was conducted at Radiotracer Laboratory,
Agricultural Research Institute, Rajendranagar, Hyderabad to study the effect
of graded levels of P fertilizer on yield, nutrient uptake, per cent P derived
from fertilizer and applied P use efficiency by Indian spinach (Beta vulgaris
var benghalensis Hort.) raised on red and black soils varying in their initial
available P fertility status. The treatments for both red and black soils
consisted of five levels of P viz., 0, 12.5, 25, 37.5 and 50 kg P2O5 ha-1
corresponding to 0, 25, 50, 75 and 100 per cent recommended dose of
phosphorus (RDP) and was tagged with 32P @ 0.4 mCi g-1 P2O5. Nitrogen
and potassium @ 25 kg N and 50 kg K2O ha-1 respectively, in the form of
urea and MOP were applied as basal dose. Top dressing of nitrogen @ 25 kg
N ha-1 was done after each cutting. Plant samples at each cutting were
analysed for N, P and K contents and radio assay for P use efficiency was
carried out. Three cuttings of the leafy vegetable were taken and results are
presented for individual cuttings as well as for the crop as a whole.
The results of the investigation revealed that the total green leaf yield
and total drymatter yield of spinach significantly increased with the
increasing levels of P upto 75% RDP in red soils and 100% RDP in black
soils. For soils having higher initial P fertility, application of P2O5 @ 37.5 kg
ha-1 was found to result in higher yields both in red and black soils. The
average per cent Pdff in spinach plants significantly increased with the
increased P application from 13.25 to 28.35 per cent in red soils and from
15.24 to 25.34 per cent in black soils. The total amount of fertilizer P uptake
by spinach increased significantly with the increase in P fertilizer application
and also with the increased initial P content of soils. However, extent of per
cent increase in total fertilizer P uptake by spinach was greater in soils with
low to medium level of initial soil P fertility compared with that of medium to
high fertility soils. Total phosphorus utilization by spinach was greater when
P was applied @ 50 kg P2O5 ha-1 (100 % RDP) to low and medium P red soils
and due to 50% RDP in high to very high P soils. In case of black soils, with
the exception of medium P soils, highest per cent P utilization of spinach
plants was noticed due to application of 12.5 kg P2O5 ha-1.
In the soils having low to medium initial P, the total amount of soil P
uptake by spinach crop increased significantly with the increase in graded
dose of RDP from 25 to 100% while in high P fertile soils such observation
was noticed only upto 50% RDP application. In general, contribution of soil
initial P to total P uptake by crop enhanced significantly with the increase in P
fertility status of soil.
In general, N content of plants decreased and P content increased with
increase in graded level of recommended dose of phosphorus. The effect of P
levels on K content was non-significant. The nutrient (N, P and K) uptake by
spinach increased with the increase in application of phosphorus level.
 
Date 2016-08-24T13:33:24Z
2016-08-24T13:33:24Z
2004
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73597
 
Language en
 
Relation D7242;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD