Influence of genotype and sowing date on camelina growth and yield in the north central U.S.

AbstractFoliar fungicide usage in soybeans in the north-central United States increased steadily over the past two decades. An agronomically-interpretable machine learning framework was used to understand the importance of foliar fungicides relative to other factors associated with realized soybean yields, as reported by growers surveyed from 2014 to 2016. A database of 2738 spatially referenced fields (of which 30% had been sprayed with foliar fungicides) was fit to a random forest model explaining soybean yield. Latitude (a proxy for unmeasured agronomic factors) and sowing date were the two most important factors associated with yield. Foliar fungicides ranked 7th out of 20 factors in terms of relative importance. Pairwise interactions between latitude, sowing date and foliar fungicide use indicated more yield benefit to using foliar fungicides in late-planted fields and in lower latitudes. There was a greater yield response to foliar fungicides in higher-yield environments, but less than a 100 kg/ha yield penalty for not using foliar fungicides in such environments. Except in a few production environments, yield gains due to foliar fungicides sufficiently offset the associated costs of the intervention when soybean prices are near-to-above average but do not negate the importance of disease scouting and fungicide resistance management.

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Effect of sowing date, population density and row spacing on growth and yield of opium poppy in north central subtropical India

The Journal of Agricultural Science ◽

10.1017/s0021859600036480 ◽

1983 ◽

Vol 101 (1) ◽

pp. 163-167 ◽

Cited By ~ 3

Author(s):

R. L. Yadav ◽

R. Mohan ◽

R. Singh ◽

M. M. Gupta

Keyword(s):

Plant Density ◽

Sowing Date ◽

Opium Poppy ◽

Growth And Yield ◽

Higher Plant ◽

Area Index ◽

North Central ◽

Sowing Dates ◽

Capsule Size ◽

Morphine Content

SUMMARYOpium poppy (Papaver somniferum Linn.) was sown at three sowing dates (10, 25 November, 10 December), row spacings (15, 30, 45 cm) and population densities (6 × 105, 3 × 105, 1·5 × 105 plants/ha) in a split-plot design at Lucknow. Sowing on 10 November resulted in higher yields of opium, seed, total dry matter and morphine content. Delayed sowing, higher plant density and narrow spacing produced low yields with less morphine content. Decline in opium yield was associated with decrease in plant height, leaf area index, capsule size and number of capsules per plant. The crop sown on 10 November removed most N. N concentration and uptake also increased when the number of plants per unit area was decreased. The study suggests that to achieve maximum yields poppy should be sown in rows 30 cm apart on 10 November with 3 × 105 plants/ha.

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The effects of several husbandry factors on the growth and yield of winter-sown barley at four sites in each of three years

The Journal of Agricultural Science ◽

10.1017/s0021859600043677 ◽

1984 ◽

Vol 103 (3) ◽

pp. 555-560 ◽

Cited By ~ 4

Author(s):

S. A. Evans ◽

M. Hough

Keyword(s):

Grain Yield ◽

Disease Control ◽

Sowing Date ◽

Light Interception ◽

The Other ◽

Growth And Yield ◽

Time Of Application ◽

Date Seed ◽

Nitrogenous Fertilizer ◽

The North

SummaryExperiments testing the effects of variety, sowing date, seed rate, amount and time of application of nitrogenous fertilizer in the spring, application of nitrogenous fertilizerin the autumn and disease control at four sites in the north of England in 1980, 1981 and 1982 are described and the results are discussed.The siting of the experiments and the seasons had important effects on grain yield and influenced the response to the total amount of nitrogen used and to disease control. The other husbandry factors produced more consistent effects. The choice of variety and drilling date had thegreatest influence on yield. The responses to the different seed rates, to the method of applying nitrogenous fertilizer and to autumn-applied nitrogen were smaller. The effects were additive.It is argued that differences in the efficiency of light interception by the foliage affects grain yield; that light interception may be influenced by the state of the foliage at the start of the period of rapid growth from April onwards; and that site, season and husbandry all affect the development of the crop up to that point.

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Sweet Corn Growth and Yield Responses to Planting Dates of the North Central United States

HortScience ◽

10.21273/hortsci.43.6.1775 ◽

2008 ◽

Vol 43 (6) ◽

pp. 1775-1779 ◽

Cited By ~ 12

Author(s):

Martin M. Williams

Keyword(s):

United States ◽

Yield Components ◽

Sweet Corn ◽

Planting Date ◽

Day Length ◽

Growth And Yield ◽

Planting Dates ◽

North Central ◽

The North ◽

Central United States

Sweet corn is planted over a 3-month period in the north central United States to extend availability for fresh market and processing; however, the extent to which development and growth of sweet corn changes during this period is unreported. Field experiments were conducted in 2006 and 2007 to determine the effect of five planting dates, ranging from mid-April to early July, on sweet corn establishment, growth, and yield components. Day length at the time of silking decreased from 15.1 h in the mid-April planting to 13.7 h in the early July planting. Development took 13 to 25 fewer days from emergence to silking for the hybrid ‘BC0805’, an 82-day augmented sugar enhancer endosperm type, as planting was delayed from mid-April to early July. Maximum height generally increased through planting dates with as much as 23% taller plants in early July versus mid-April planted sweet corn. While leaf mass was unaffected by planting date, maximum leaf number and rate of leaf appearance steadily decreased with later planting dates. Lower reproductive and total biomass at silking as well as marketable ear yield components were lowest in the early July planting date and were associated with presence of maize dwarf mosaic virus in leaf samples. In response to environmental conditions, the crop canopy undergoes distinct morphological changes as planting is delayed, and those changes may have implications for crop production.

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