scholarly journals MAXIMIZING POTATO PRODUCTION VIA NITROGEN FERTILIZATION AND PLANT SPACING

2014 ◽  
Vol 22 (1) ◽  
pp. 29-41
Author(s):  
Farag, A. A. ◽  
Abdrabbo M. ◽  
Abul-Soud M.
Keyword(s):  
Nitrogen Fertilization ◽  
Potato Production ◽  
Plant Spacing

DIFFERENCES IN RESPONSE OF TWO VARIETIES OF CIGAR TOBACCO TO VARIATIONS IN PLANT POPULATION AND NITROGEN FERTILIZATION

1965 ◽  
Vol 45 (3) ◽  
pp. 264-269
Author(s):  
F. H. White
Keyword(s):  
Nitrogen Fertilizer ◽  
Nitrogen Fertilization ◽  
Chemical Characteristics ◽  
Index Number ◽  
Yellow Leaf ◽  
Plant Spacing ◽  
Total Alkaloids ◽  
Number Of Leaves ◽  
Grade Index ◽  
Physical And Chemical

The effect of spacing and nitrogen fertilizer levels on some agronomic, physical, and chemical characteristics of two varieties of cigar tobacco were compared over a 3-year period.At each of two nitrogen fertilizer levels, the variety Pennsylvania Broadleaf, irrespective of plant spacing, produced higher yields and returns per acre, more leaves per plant and weight per leaf, but a higher percentage of midrib and yellow trash leaf than the variety Resistant Havana 211. Although the differences between the varieties at each nitrogen level were relatively unaffected by plant spacing, the 20-in. spacing caused a decrease in yield, crop returns, and percentage of yellow leaf and an increase in weight per leaf and percentage of filler leaf from that obtained with the 16-in. spacing. An increase in nitrogen fertilizer from 24 to 60 lb per acre had little effect on Resistant Havana 211 other than to increase the weight per leaf. The additional nitrogen with Pennsylvania Broadleaf, however, increased the yield, crop returns, weight per leaf, and percentage of filler leaf. The variation in rate of nitrogen fertilizer had little effect on grade index, number of leaves per plant, and percentages of nicotine, nornicotine, and total alkaloids in both varieties.The combination of 16-in. spacing with 60 lb of nitrogen was superior to other combinations of 16- or 20-in. spacing with 24 or 60 lb of nitrogen per acre for the production of cigar filler leaf in each of two varieties.

scholarly journals NITROGEN FERTILIZATION AND NARROW PLANT SPACING STIMULATES SUNFLOWER PRODUCTIVITY

2015 ◽  
Vol 20 (1) ◽  
Author(s):  
Muhammad AWAIS ◽  
Aftab WAJID ◽  
Ashfaq AHMAD ◽  
Muhammad Farrukh SALEEM ◽  
Muhammad Usman BASHIR ◽  
...  
Keyword(s):  
Nitrogen Fertilization ◽  
Plant Spacing

Sweet potato production in a short-season area utilizing black plastic mulch: effects of cultivar, in-row plant spacing, and harvest date on yield parameters

2016 ◽  
Vol 96 (1) ◽  
pp. 139-147
Author(s):  
David Wees ◽  
Philippe Seguin ◽  
Josée Boisclair
Keyword(s):  
Sweet Potato ◽  
Ipomoea Batatas ◽  
Potato Production ◽  
Harvest Date ◽  
Root Weight ◽  
Base Temperature ◽  
Plant Spacing ◽  
Plastic Mulch ◽  
Sweet Potatoes ◽  
Black Plastic

The sweet potato (Ipomoea batatas (L.) Lam.) requires a long, hot growing season to attain good yields. In a cool climate, the use of black plastic mulch to heat the soil can improve growth but cultivars, plant spacing, and harvest date must be carefully selected to optimize yields and to attain market quality standards. In this two-year study in Quebec, Canada, two sweet potato cultivars (‘Georgia Jet’ and ‘Beauregard’) were grown at four in-row spacings (15, 30, 45, and 60 cm) and harvested at three dates (mid September, late September, and early October). Cumulative growing degree-days (GDD) with base temperatures of 10°C and 15.5°C were calculated for each harvest date. ‘Georgia Jet’ had higher total and marketable yields than ‘Beauregard’. In-row spacing had no effect on yields per hectare of ‘Beauregard’ and only affected ‘Georgia Jet’ in one year of the study. Average root weight of sweet potatoes, yields per plant, and number of roots per plant increased with wider spacing. Delaying harvest by one or two weeks had little effect on ‘Beauregard’ but increased yields of ‘Georgia Jet’. GDD may be a useful predictor of optimum harvest date but a lower base temperature used to calculate GDD may be desirable with ‘Georgia Jet’ as its yields continued to increase even when growing under cool conditions of late September and early October.

scholarly journals Plant density and nitrogen fertilization in Swiss chard

2012 ◽  
Vol 30 (4) ◽  
pp. 703-707 ◽  
Author(s):  
Márcia de M Echer ◽  
Tiago Zoz ◽  
Charles Douglas Rossol ◽  
Fábio Steiner ◽  
Deise D Castagnara ◽  
...  
Keyword(s):  
Nitrogen Fertilization ◽  
Plant Density ◽  
Total Yield ◽  
Plant Spacing ◽  
Fresh Weight ◽  
Marketable Yield ◽  
N Accumulation ◽  
Swiss Chard ◽  
N Rates ◽  
Total Fresh Weight

An experiment was conducted to evaluate the effect of plant spacing and nitrogen fertilization on Swiss chard's yield, from September to November 2009. The experimental design was of randomized blocks in split plot with four replications. In the plots were allocated the two plant spacings (0.30 and 0.50 m) and in the subplots the five doses of nitrogen (0, 40, 80, 120 and 160 kg ha-1). The crop was harvested 90 days after transplanting. The plant spacing of 0.50 m provided increased production of total fresh weight of shoot (961.7 g plant-1) and marketable (873.1 g plant-1). However, the highest total yield (77.8 t ha-1) and marketable (64.5 t ha-1) was achieved with the smaller spacing between plants (0.30 m). The N rates applied in coverage until 160 kg ha-1 increased in a linear form the total and marketable production of fresh mass of shoots, the total and marketable yield, the N content and the N accumulation in the shoots of Swiss chard plants on the evaluated plant spacings.

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