Corn and soybean planting fell behind the five-year averages in the latest week as plenty of rain has sidelined planters.

The U.S. Department of Agriculture said 47% of the nation's corn and 14% of the soybeans were planted. Illinois reported only 0.6 day suitable for fieldwork as the state averaged nearly 2 in. of rain last week. In addition, it was cold, with the average temperature at 51.4°F, 6.5 degrees below normal.

Iowa was a little better, with 3.4 days of fieldwork, as dry weather late in the week allowed farmers in the fields by the weekend.

“Fifty-two percent of the corn crop has been planted, remaining over a week behind last year and slightly behind the five-year average. Northeast Iowa has the smallest percentage of corn planted, at 35%, while central Iowa has the most planted, at 65%,” the Iowa report said.

Seven percent of Iowa’s corn was emerged, compared with 25% a year ago and the 15% average.

Illinois corn planting went to 65% from last week’s 63% and topped the five-year average of 63%. Emergence was 29% versus the 32% average.

“Producers reported some ponding and flooding in fields,” the Illinois report said. “Precipitation averaged 1.89 in., 0.92 in. above normal. Topsoil moisture supply was rated at 41% adequate and 59% surplus.”

Nebraska corn was 48% planted and 10% emerged, compared with averages of 55% and 15%.

The national winter wheat condition rating dropped one point to 53% good/excellent, but declines were bigger in Kansas, where a spring storm hit parts of the state.

Kansas said the impact the cold and snow a week ago had on the wheat was still being assessed. The state’s wheat rating dropped to 43% good to excellent, down from 49% a week ago. Oklahoma’s wheat improved, with a rating of 49% good/excellent, compared with 47% last week.

“Winter wheat yield potential dropped last week, with big losses seen in Kansas and Illinois -- two states hit hard by rain and snow,” Bryce Knorr, Farm Futures senior grain analyst, said. “Kansas yield potential slipped 3.8 bu. per acre (bpa) to 41 (bpa), according to our model, with Illinois down 4 bpa to 68.8 (bpa).”

Illinois wheat was rated 60% good/excellent this week, down from 72% a week ago.

Knorr said the U.S. average wheat yield potential declined 0.2 bpa -- according to USDA’s national rating -- to 46.3 bpa, with the projection based on state-by-state ratings down a full bushel per acre to 48 bpa.

Spring wheat planting reached 54% with emergence at 21%, compared with the averages of 60% and 29%. North Dakota spring wheat was 45% planted versus the 49% average and 11% emerged versus the 20% average.

“Warm temperatures allowed for significant planting progress and some emergence. Warm temperatures also continued to dry out the soil in parts of southern North Dakota. There were 6.5 days suitable for fieldwork,” North Dakota reported.

Corn planting in North Dakota was at 23% completed versus the 34% average.