Effects of high plant populations on the growth and yield of winter oilseed rape (Brassica napus)

1999 ◽  
Vol 132 (2) ◽  
pp. 173-180 ◽  
Author(s):  
J. E. LEACH ◽  
H. J. STEVENSON ◽  
A. J. RAINBOW ◽  
L. A. MULLEN
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Plant Density ◽  
High Density ◽  
Growth And Yield ◽  
Winter Oilseed Rape ◽  
Plant Populations ◽  
Rothamsted Experimental Station ◽  
Plant Densities ◽  
Very High

The effects of plant density on the growth and yield of winter oilseed rape (Brassica napus) were examined in a series of five multifactorial experiments at Rothamsted Experimental Station between 1984 and 1989. Plant densities, manipulated by changing the seed rate and row spacing, or because of overwinter losses, ranged from 13·5 to 372 plants/m2. Normalized yields for the multifactorial plots increased with densities up to 50–60 plants/m2. In very high density plots in 1987/88, yield decreased as density increased >150 plants/m2. Plants grown at high density had fewer pod-bearing branches per plant but produced more branches/m2. Branch dry matter (DM) per plant was decreased by 42%, the number of fertile pods per plant and pod DM/plant by 37%. There was no effect of density on the number or DM of pods/m2. Over 74% of the fertile pods were carried on the terminal and uppermost branches of plants grown at high density in 1987/88 compared with only 34% in plants grown at low density in 1988/89. Seed DM/plant decreased with increase in density but seed size (1000-seed weight) increased. There was no effect of density on seed glucosinolate or oil contents.

scholarly journals COST AND RETURN ANALYSIS OF SMALL-SCALE PRODUCTION OF Brassica Napus L. Varchinensis (PECHAY) USING DIFFERENT METHODS OF CULTIVATION

2019 ◽  
Vol 7 (6) ◽  
pp. 10-17
Author(s):  
Eunice L. Lluz ◽  
Madelyn Yruma
Keyword(s):  
Brassica Napus ◽  
Plant Density ◽  
Block Design ◽  
High Density ◽  
Growth And Yield ◽  
Planting Density ◽  
Small Scale ◽  
Scale Production ◽  
Brassica Napus L ◽  
Direct Seeded

A Cost and return analysis of small scale production of Brassica napus L. varchinensis (Pechay) production using different methods of cultivation was evaluated based on the growth and yield performance of Brassica napus L. varchinensis (Pechay) from field trial. An experiment was undertaken involving four treatments with two methods of planting and two levels of plant density and layed out in Randomized Completely Block Design (RCBD) with replications.  Results showed that the survival rate and growth of Brassica napus L. varchinensis (Pechay) based on the actual number of plants, transplanted plant with high density plants was significantly higher compared to other treatments indicating that transplanted Pechay at high density planting is favorable than other methods. The fresh weight of Pechay after 30 days of cultivation using direct seeding (T1 and T2) was significantly higher compared to T3 and T4.  Partial cost and return analysis in direct seeded Pechay at high planting density were the most profitable while transplanting Pechay seedling at low density planting was the least profitable.

The effects of timing of control of weeds on the yield of winter oilseed rape (Brassica napus), in the context of the potential commercialization of herbicide-tolerant winter rape

2004 ◽  
Vol 142 (3) ◽  
pp. 263-272 ◽  
Author(s):  
S. E. FREEMAN ◽  
P. J. W. LUTMAN
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Yield Loss ◽  
Crop Growth ◽  
Growth And Yield ◽  
Late Winter ◽  
Winter Oilseed Rape ◽  
Stellaria Media ◽  
Winter Rape ◽  
Herbicide Tolerant

Three experiments have investigated the effect of the timing of control of infestations of volunteer barley (Hordeum vulgare), Stellaria media and Galium aparine on the growth and yield of winter oilseed rape (Brassica napus). Although the experiments used conventional herbicides to achieve the different timings of control, the work was done in the context of the commercialization of herbicide-tolerant oilseed rape, where treatments could be applied at any time from autumn to spring. In the three seasons studied, oilseed rape growth was particularly vigorous in the autumn and, as a consequence, the competitive impact of the weeds was lower than anticipated. Untreated volunteer barley and G. aparine reduced yields in one and two experiments, respectively. However, in all experiments volunteer barley reduced crop growth in winter and spring severely, even though January treatments prevented yield loss in these vigorous crops. Delayed control of this weed would not be advisable if the weed was particularly dense or the crop less vigorous. In contrast, the G. aparine had no effect on crop growth and was only really apparent in the crop in late summer, so delaying treatment until even March would not put yields at risk. In one year, S. media markedly reduced crop growth in late winter but in the second experiment this did not occur. Consequently, as with the G. aparine, delayed autumn control would be unlikely to jeopardize yields. Thus, if herbicide-tolerant crops are commercialized in Europe, there will be flexibility in timing of application of herbicides to control broad-leaved weeds in winter rape but there would be a risk of yield loss from delayed control of volunteer cereals.

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