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DETOPPING INFLUENCE ON PRODUCTIVITY OF RABI MAIZE (Zea mays L.)

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Title DETOPPING INFLUENCE ON PRODUCTIVITY OF RABI MAIZE (Zea mays L.)
 
Creator MANJU BHARGAVI, B
 
Contributor MUKUNDAM, B
 
Subject topping, silk, yields, grain, planting, maize, biological phenomena, crops, diseases, productivity
 
Description A field experiment entitled “Detopping influence on productivity of rabi maize
(Zea mays L.)” was conducted during rabi, 2014-15 at College Farm, College of
Agriculture, Rajendranagar, Hyderabad. The soil of the experimental field was sandy loam
in texture with pH of 7.5, EC 0.163 dSm-1 and organic carbon 0.40%. The soil was low in
available nitrogen (175 kg ha-1), medium in available phosphorus (36 kg ha-1) and high in
available potassium (342 kg ha-1). The experiment was laid out in a randomized block
design comprising of a factorial combination of three stages of detopping and three heights
of leaves detopping. The three stages are (D1-10 days after silking, D2 -20 days after
silking and D3-30 days after silking) were tested with three heights of leaves viz., L1-
detopping up to two leaves, L2- detopping up to four leaves, L3 -detopping up to six leaves
with a control and replicated thrice. The results revealed that, different stages and different
heights of detopping in maize significantly influenced the growth parameters, yield
attributes and yield, but its effect was not observed on nutrient content (%), uptake (NPK)
and available nutrient status (N, P2O5, K2O).
Detopping at different stages was not influence on plant height, number of leaves,
chlorophyll content, LAI, stover yield, number of cob plant-1, girth of the cob, number of
grain rows cob-1, green fodder yield, nutrient content in plant and final soil nutrient status.
Significantly more dry matter (1286 g m-2 and 1641 g m-2) was observed at 90 DAS and at
harvest, respectively, less number of barren plants, length of the cob (15 cm), no. of grains
row-1 (31.4), no. of grains cob-1 (489.5), test weight (28.8), grain weight cob-1 (153.6 g),
grain yield (7204 kg ha-1), cob weight (203 g), cob yield (8033 kg ha-1), nutrient uptake
(NPK), gross returns (105713 ` ha-1), net returns (72992 ` ha-1) and B:C ratio (3.16)
observed with D3 (detopping at 30 days after silking) and it was on par with D2 (detopping
at 20 days after silking). Significantly higher reduction in yield attributes and yield was
noticed in detopping at 10 days after silking (D1).
Detopping at different heights has pronounced effect on growth and yield
parameters. Less reduction in plant height (192.9 cm), number of leaves (12.1), LAI (4.16)
was noticed in L1 (detopping up to 2 top leaves) over L2 and L3 (detopping upto 4 and 6 top
leaves, respectively). More dry matter (1243 g m-2 and 1588 g m-2, respectively) was
observed at 90 DAS and at harvest, less number of barren plants, length of the cob (14.3
cm), girth of the cob (16.7 cm), no. of grains row-1 (28.9), no. of grains cob-1 (446.4), 100-
grain weight (27.8), grain weight cob-1 (147.5 g), grain yield (6568 kg ha-1), stover yield
(6631 kg ha-1), cob weight (195 g), cob yield (8145 kg ha-1) and nutrient uptake (NPK)
could be achieved with L1 (detopping up to 2 top leaves), however L1 was found to be on
par with L2 (detopping up to 4 top leaves). Higher gross returns (94935 ` ha-1), net returns
(62214 ` ha-1) and B:C ratio (2.90) were noticed in L2 and it was on par with L1.
Significantly more reduction in growth parameters and yield attributes, grain yield and
stover yield was observed in L3. However more green fodder obtained from L3. Different
heights of detopping did not influenced the SPAD readings, no. of cobs plant-1 and no. of
rows cob-1.
Interaction effect of detopping on yield attributes and grain yield was found with
detopping at 30 days (D3) up to 2, 4 and 6 top leaves and which was on par with detopping
at 20 days after silking up to 2 and 4 top leaves. Higher returns and B:C ratio were
obtained with detopping at 30 days after silking up to 6 top leaves and on par with
detopping up to 2 top leaves and detopping at 20 days after silking up to 4 top leaves.
Perceivably higher growth parameters were recorded in control (no detopping) and
it was significantly superior to all detopped treatments. On the other hand, yield attributes
and grain yield were found to be on par with detopping at 30 days after silking up to 2, 4
and 6 top leaves and detopping at 20 days after silking up to 2 and 4 top leaves. With
respect to B:C ratio, control recorded on par results with that of detopping at 30 days after
silking up to 2, 4 and 6 top leaves and detopping at 20 days after silking up to 2 ,4 and 6
top leaves.
Without considerable reduction in growth parameters, yield attributes and yield,
higher grain yield and green fodder yield could be achieved with detopping at 20 days after
silking (D2) up to 4 top leaves (L2).
 
Date 2017-01-03T09:42:56Z
2017-01-03T09:42:56Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/94036
 
Language en
 
Relation D9901;
 
Format application/pdf
 
Publisher PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY. HYDERABAD