HOTLINE: (+84) 2513 918 531

Agriculture news: Forecasters predict cool start to October

Admin - 30/09/2019

A killing frost can be forecast up to seven days in advance though none is forecast at the present time.

Image result for agriculture october

Now the Midwest agricultural meteorologists are waffling on a temperature forecast for October, tending to call for below normal temperatures for the first part of the month.

A killing frost can be forecast up to seven days in advance though none is forecast at the present time.

The Enviroweather growing degree day (GDD) totals at the Petersburg/Deerfield site show a need for more heat units. For 2019 the GDD total since May 1 is 2,656 GDD (base 50 degrees F) and 2,338 GDD as of June 1. These numbers compare more closely to 2017, which had a May 1 total of 2,630 and June 1 total of 2,289.

The years 2018 and 2016 compare closely with their GDD numbers; May 1, 2018, had 2,944 while 2016 was 2,940 and for June 1, 2018, had 2,453 and 2016 had 2,559.


Corn drydown can be estimated using Growing Degree Day units. Generally it takes about 30 GDD to lower grain moisture each point from 30 percent down to 25 percent. Drying from 25 to 20 percent requires about 45 GDD per point of moisture.

Leaf diseases such as anthracnose, tar spot, gray leaf spot, Northern or Western corn leaf blight can cause the corn plant to prematurely shut down resulting in variability for grain moisture.

Midwest Land grant university agronomists generally recommend starting to harvest corn at about 24 to 25 percent moisture. Allowing corn to remain in the field below 20 percent risks yield losses from stalk rots, lodging, ear drop or rots, insect feeding and wildlife damage. Grain moisture should be monitored once black layer is achieved.

A harvest moisture level that balances harvest losses and grain drying costs allows maximum economic return potential. A plan to take advantage or a rapid drydown and allow everything to field dry could be costly if fall storms cause lodging.



Two main factors will combine to limit soybean yields in 2019. One is the late planting that will result in lower number of pods that are filling.

Reasons include a late canopy formation, lower than normal numbers of nodes with pods and low pod numbers per node.

The other factor is the late start of podsetting followed by the late start of seedfilling. Early varieties mature earlier than later ones because the period of pod formation is shorter in early varieties and because seedfilling starts earlier.

One key will be seed size and weight, which continue to increase before leaves lose their color.

Daylength, temperature and moisture all play a role in prolonging or shortening plant growth and maturity, and therefore seed filling.

Cover crops


Regardless of going from soybeans to corn or from corn to soybeans for 2020, cereal rye is the cover crop recommended by MSU.

Ideally, plant rye as soon after harvest as possible and no later than one week after the 50 percent chance of a 32 degree F frost, which puts the last date for seeding in Monroe County about Oct. 29.

Drill or broadcast with a shallow incorporation to ensure good seed to soil contact.

Past trials at the Kellogg Biological Station where negligible growth was observed in the fall and winter still resulted in a good stand the following spring. Terminating cereal rye in the spring is critical when plants are only 6 to 12 inches tall or about two weeks before planting corn or soybeans.

Termination can be done by tillage or herbicide but can be tricky with wet spring weather. One option is to plant directly into standing green plants and then apply a full rate of glyphosate before the crop emerges.

Tin liên quan

Copyright © 2018 Dai Viet. Web design : NiNa Co., Ltd
Online: 51 | Tổng truy cập: 1740821