Influence of Ploughing Depth, Phosphorus Fertilizer Level and Thinning Date on Sugar Beet Productivity and Quality

Abstract

This investigation was conducted at El-Manyal Village, Talkha District, Dakahlia Governorate, during 2012Governorate, during /2013Governorate, during and 2013Governorate, during /2014 seasons to study the effect of ploughing depth (0.0, 10, 20 and 30 cm), phosphorus fertilizer levels (0.0, 15.5 and 31.0 kg P2O5/fad) and thinning dates (at 20, 30 and 40 days after sowing) on productivity and quality of sugar beet "variety Kawemira". A split-plot design with four replicates was used for each ploughing depth during the two seasons (each ploughing depth was considered as a separate experiment). The main results of this investigation could be summarized as follows: 1-Increasing ploughing depths from 0.0 up to 30 cm significantly increased root fresh weight, root length, total soluble solids percentage (TSS %) as well as root and sugar yields/faddan. On the other hand, it significantly decreased root juice purity percentage in both seasons. 2-Increasing phosphorus fertilizer levels from 0.0 to 15.5 and 31.0 kg P2O5/fad, significantly increased all studied characters in both seasons. 3-Delaying thinning dates from 20 to 30 and 40 days after sowing markedly decreased all studied characters, except root diameter in both seasons. 4-The interactions among studied factors showed insignificant effects, except for the effect of the interaction between ploughing depth and phosphors fertilizer levels on root length in the first season and sugar yield/fad in the second season.Increasing ploughing depth to be 30 cm, adding 31.0 kg P2O5/fad and thinning at the age of 20 days was the suitable recommendation to maximize sugar beet root yield and quality under the environmental conditions of Dakahlia Governorate.

Effect of Varieties, Phosphorus and Boron Fertilization on Sugar Beet Yield and its Quality

“…These results are in full accordance with those reported Abo-El-Goud 2000; Seadah (2012) and Abdou et al (2014) Increasing boron fertilizer levels from 0 to 0.750 and 1.125 kg fed -1 (Borax) tended to increase root diameter from 11.87 to 12.35 and 12.85 in the first season and 13.69 to 14.22 and 14.67 cm in the second one. These findings are accomplished with those observed by the enhancing effect root diameter may be attributed to the increase in cell size and numbers as a result of the increasing division of cells as well as activating accumulation of metabolites in storage roots.…”

“…It can be suggested that this increase in sucrose % may be reflected the role of phosphorus in improving growth and dry matter accumulation by increasing the uptake and availability of most nutrients, consequently enhancement sucrose content in roots. Abdou et al (2014) and El-Mansoub et al (2014) suggested similar results.…”

“…Seadh (2012) stated that application of 30 kg P 2 O 5 fed -1 , produced the highest values of growth characters and the highest values of the root, top and sugar yields fed -1 , in both seasons. Abdou et al (2014) found that adding 31.0 kg P 2 O 5 fed -1 and thinning at the age of 20 days was the suitable recommendation to maximize sugar beet root yield and quality under the environmental conditions of Dakahlia Governorate. Hussain et al (2014) declared that the addition of P1 (the first rate) and P2 (the second rate) increased beet yield by 37 and 47% over control.…”

Effect of Phosphorus, Boron and Magnesium Fertilization on Yield and Quality of Sugar Beet Grown in a Sandy Soil

“…It was found that the differences between 30 and 45 kg P2O5/fed in their influence on the above-mentioned growth traits were insignificant, in the two growing seasons. In this respect, Ismail and Abo El-Ghait (2004) and Abdou et al (2014) remarked that increasing the amount of P-fertilizer up to 30 kg of P2O5/fed markedly increased root weight/plant. Data in the same Table exhibited a gradual and/or statistical increase in root diameter, fresh weights of root and foliage/plant and root/top ratio, as a result of raising the concentrations of boron solution sprayed on sugar beet foliage from zero up to 150 ppm, in both seasons.…”

Effect of Ploughing Depths, Irrigation Intervals and Plant Densities on Sugar Beet Yields and Quality تأثیر عمق الحرث وفترات الری والکثافة النباتیة على انتاجیة وجودة نبات بنجر السکر

“…Soil loosening by means of deep-tillage systems improves water infiltration, internal drainage, and aeration in the soil; increases root depth, intensity, and development; and allows for deeper fertilizer placement (Diaz-Zorita, 2000 andStrudley et al, 2008). Abdou et al (2008) found that increasing number of ploughings from zero (without plough) up to three times significantly increased root weight with 22.96 and 21.31 %, root span with 22.82 and 18.25 %, root yield (t/fed) with 23.19 and 21.03 % and sugar yield (t/fed) with 21.23 and 16.60 % in the 1 st and 2 nd years, correspondingly . Enan et al (2008) found that increasing plowing depth from 25 up to 40 cm, significantly increased root dimensions and root sucrose percentage in equally years and total soluble solids (TSS) in the 2 nd season.…”