- Author: Mark Lundy
After a relatively dry start to the rainfall season from October through early November, rainfall in California since November has been above average. About halfway through the rainy season, year-to-date precipitation totals are approximately 20-30% greater than the 10-year average in the small grain growing regions of California (Figure 1).
Growing degree days (GDD: 86F max; 45F min) for common wheat and other small grains have been accumulating more rapidly than the 10-year average since the middle of November (Figure 2), which has been primarily a function of warmer than average night-time temperatures (Figure 3).
The UC Small Grain Testing Program established small grain variety...
- Author: Mark Lundy
After almost 6 weeks without a substantial rainstorm, there is finally some precipitation starting to appear in the 10-day forecast for the Sacramento Valley. The lack of rain thus far has made it difficult to proceed with N fertilizer topdress applications in non-irrigated wheat fields this season. In addition, the warmer than normal temperatures have increased the rate of crop development such that many fall planted wheat crops are further along than would normally be the case at this time of year. Figures 1 and 2 below represent the cumulative rainfall since 10/1/2017 and the cumulative growing degree days (GDD) for wheat since 11/21/17, when we planted our experimental trials in Davis (each is compared to a 10-year...
- Author: Mark Lundy
- Author: Konrad Mathesius
Recent UCCE research has illustrated the value of in-season applications of nitrogen (N) fertilizer, particularly applications made at the early vegetative growth stages. This is typically the stage of growth when N demand from the crop is increasing rapidly, the soil is beginning to warm up, and microbial metabolism and associated mineralization/transformations of the various forms of N are increasing. Over a wide range of California conditions and across multiple seasons, applications of N fertilizer at this stage of growth have been shown to
- Author: Mark Lundy
- Author: Steve Orloff
- Author: Nicholas Clark
- Contributor: Robert B Hutmacher
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We have received several recent inquiries following on our blog post from late January that discussed the potential value of a nitrogen (N) topdress at the tillering-to-jointing stages of wheat growth. This is particularly an issue with the higher than average precipitation we have experienced in California this year. The current question is whether a topdress of N might still be beneficial to wheat crops that are in the late-boot to early-heading stages of growth. Although fall-planted wheat...
- Author: Mark Lundy
- Author: Steve Orloff
- Contributor: Steven D Wright
- Contributor: Robert B Hutmacher
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Over the past 4+ seasons, a UCCE team (Lundy, Orloff, Wright and Hutmacher) has revisited nitrogen (N) fertilization recommendations for hard spring wheat specific to California conditions. We have grown wheat under a wide range of conditions and soil types, while varying the timing and quantity of N fertilizer to create conditions of N deficiency and sufficiency at the various times in the season when a grower might consider a N topdress.
Image 1. Hard spring wheat (UC Patwin 515) grown in the 2014-15 season in Davis where N fertilizer (urea) was/was not broadcast-applied near the beginning of...
