Yield gap associated with crop management in wheat (Case study: Ardabil province-Parsabad Moghan)

Abstract

T O INVESTIGATE the factors affecting irrigated wheat yield loss, compared to the attainable yield, a non systematic survey experiment was conducted in 60 fields in the city of Parsabad-Moghan, during two years 2013-2014 and 2014-2015 using Comparative Performance Analysis (CPA). Sampling of wheat fields was performed randomly from 5 different points of each farm using a square meter. All the information about management operations, soil and crop characteristics including seed bed preparation, planting date, varieties and their site preparation, seed rate, planting ways, weeds control ways, amount and timing of herbicides and fungicide use and wheat harvest time were recorded during a seasonal year using questionnaire. At the end of the seasonal year, the actual yield harvested by farmer's was recorded. Among the various parameters, planting time, spike density, the number of split application of urea, land preparation operations, farmer experience and repeated use of fungicides had significant effects on wheat yield. The results showed that the average actual yield (6431.85kg/ha) and attainable yield (8749.27kg/ha), were different with a gap of 2317.42kg per hectare. The share of each of the factors were: Wheat planting time of yield gap 18%, spike density, 29%, the split application of urea 20%, land preparation operations 4.6%, farmer experience 14.3%, repeated use of fungicides 13.4%. The improvisation cases referred above can reduced yield gap and increase yield to more than 8.7ton/ha.

Phenology and yield response of wheat varieties as influenced by sowing dates at gonde and ardayita seed production farm, Ethiopia

“…The more vigorous cultivars have longer days, but the less vegetative and early maturing varieties hasten the grain filling process. In accordance with this, other researcher investigated that there is a substantial variation in the duration of the grain filling phase between two wheat crop varieties shows significant difference (Shirinzadeh, 2017).…”

“…Accordingly, the number of seed affected as an increase in temperature above the optimum, resulting in floret abortion in lately sown wheat crops (El-Saragand Ismaeil, 2013). Additionally the number of seeds per spike increased linearly as the amount of spike dry matter increased during pollen transfer between male and female reproduction (Shirinzadeh et al, 2017).…”

Optimizing the Sowing Date and Pattern to Improve Wheat Productivity Using a Crop Growth Simulation Model in Kharga Oasis-Egypt

“…. 110.63 101.08 11.33 11.75 334.3 335.17 40.83 37.83 45.90 53.00 6.20 7.22 18.84 21.78 33.01 33.06 10 Nov. 111.60 103.17 11.68 12.09 408.3 394.17 41.50 33.83 54.38 44.71 7.17 7.36 22.22 23.84 32.33 30.88 20 Nov. 111.36 112.08 12.75 11.90 394.4 385.25 40.42 41.00 66.44 51.32 8.26 7.06 26.66 21.93 31.15 32.35 30 Nov. 105.23 100.42 12.29 13.00 368.5 371.83 34.50 38.17 56.58 53.23 7.36 6.93 23.47 22.10 31.48 31.48 10 Dec. 109.25 105.67 10.41 11.29 381.16 382.83 35.67 40.17 58.73 46.35 7.16 6.74 21.87 20.38 32.79 The height of a crop is primarily determined by the genetic composition of a genotype, but it can also be influenced by environmental factors (Shahzad et al, 2007 andShirinzadeh et al, 2017). One possible factor contributing to the differences in optimal sowing dates between seasons is temperature fluctuations.…”