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Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCES   Spring 2003 , Volume 9 , Number 1; Page(s) 105 To 124.
 
Paper: 

EFFECTS OF PLANTING DATE AND PATTERN ON SOME PHYSIOLOGICAL GROWTH INDICES OF SUGARBEET

 
 
Author(s):  SOLEYMANI A., KHAJEHPOUR MOHAMMAD REZA, NOURMOHAMMADI G., SADEGHIAN Y.
 
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Abstract: 
An experiment was conducted in 1999 in Mashhad Agricultural Research Station. To evaluate the growth response of sugarbeet, var IC__1 (multigerm) under different planting dates and patterns. A split split-plot layout within a randomized complete block design with four replications was used. Mainplots were planting dates (May, 5th and June, 10th), subplots were row spaces (50 and 60 cm) and sub-sub plots were plants densities (8, 10 and 12 plant m^-2). Delayed planting date, increased row spacing and decreased planting density, resulted in lower leaf area index (JAI), total dry matter (TDM) and crop growth rate (CGR). Net assimilation rate (NAR) reduced as planting was delayed, but was not considerably affected by row spacing or planting density. The least LAI, TDM and CGR were produced by eight plant m^-2 density in both planting dates and row spaces. However, due to higher light use efficiency of lower LAI, eight plant m^-2 density had higher NAR. The results indicates that 10 plant m^-2 density in 50 cm row spacing may be suitable for both normal and delayed plantings, under conditions similar to this experiment.
 
Keyword(s): SUGARBEET, LAI, TDM, NAR, CGR
 
References: 
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