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PHYSIOLOGICAL RESPONSE
OF AUTUMN PLANTED SUGARCANE TO SOIL MOISTURE DEPLETION AND
PLANTING GEOMETRY ON DIFFERENT SOILS UNDER ARID
CONDITIONS
EJAZ AHMED KHAN1,
ABDUL GAFFAR SAGOO2 AND GUL HASSAN3
Abstract:
A field experiment
was conducted on autumn planted sugarcane
cv. HSF 240 at two locations, i.e., Research Area at Rakh Bibi Campus
Gomal University, Dara Ismail Khan on Silty clay soil and Main Line
Lower Land Reclamation Research Station, Chak No 37 TDA (Thal
Development Authority) Bhakkar, Pakistan on sandy loam soil during
2003-04 and 2004-05. The experiment was laid out according to a
randomized complete block design (RCBD) with a split plot arrangement
having four replications. There were four available soil moisture
depletion levels (ASMDL) including ASMDL1 -20%, ASMDL2
-40%, ASMDL3 - 60% and ASMDL4
-80%, which were kept in main plots and four planting patterns viz. G1
-60 cm, G2 -75 cm spaced single row planting patterns
and G3 -30/90, G4 -30/120 cm spaced paired row
strip planting pattern, assigned to the sub plots having net subplot
size of 24 m2. Analysis of pooled data of both locations
showed that Leaf area index (LAI), Leaf area duration (LAD), Crop growth
rate (CGR) and Net assimilation rate (NAR) were significantly affected
by ASMDL and were maximum at 40% ASMD level followed by 60%, 20% and the
minimum at 80% ASMD level during both years. Whereas LAD, CGR and NAR
were also significantly affected and were maximum in 30/90cm spaced
paired row strip planting pattern followed by 75 cm and 60cm and minimum
in 30/120cm spaced paired row strip planting pattern during both years.
Treatments interactive effects of ASMD levels and planting patterns on
LAD, CGR and NAR were significantly different except LAI and were
maximum in 40% ASMDL x 30/90cm spaced paired row strip planting pattern
and minimum in 80% ASMDL x 30/120 cm spaced paired row strip planting
pattern during both years. Therefore it was concluded that under arid
conditions on Silty clay and sandy loam soils sugar cane crop gave best
physiological performance by irrigation at 40% ASMD level and sowing in
30/90 cm spaced paired row strip planting pattern.
1Faculty of Agriculture, Department of Agronomy Gomal University Dera
Ismail Khan, Pakistan
2MLL Land Reclamation Research Station 37 TDA Bhakkar, Pakistan
3Department of Weed Science, NWFP Agricultural University, Peshawar,
Pakistan
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