Maize

Nitrous oxide (N2O) emissions in agriculture primarily come from the microbial processes of nitrification and denitrification in the soil, and they’re strongly influenced by nitrogen management practices, particularly the use of nitrogen fertilizers. □ Why Crops Cannot Directly Utilize Atmospheric Nitrogen (feat. Nitrogen Cycling in Soil)? ■ Nitrification: The microbial process in which ammonium (NH4+), … Read more

Now, the current growing stage is R1, and most of the fertilization is finished. Silks change color and become brown. Silks begin to elongate around the V12 stage. It starts from the ovules near the base of the corn cob and then develops sequentially from the base to the top. Silking of the tip ovules … Read more

The growing point and the tassel go above the soil surface around the V6 stage. The number of kernel rows is being determined from V7 to V8. The stalk begins to elongate. Also, you can see the corn tassel.

After 18 – 20 days from R1 stage, the kernels become mostly yellow and contain “milky” white fluid (i.e. starch accumulates). However, moisture content of kernel at R3 is around 80%. Starch accumulation continuously occurs in the endosperm, and cell division of endosperm is almost complete, indicating that growth of kernels since R3 would be … Read more

I harvested some corn plants at R1 stage 12 days ago. Around R1 stage, final kernel number would be determined. In corn, kernel row number (girth) and number per row (length) in an ear are main yield components. Girth determination of the uppermost ear (the ear harvested) begins shortly after the ear shoot is initiated … Read more

In corn, R1 stage (silking) is one of the most critical period to determine yield potential. The emergence of silk is regarded as the initiation of reproductive period. Each ovule (potential kernel) on the ear develops its own silk (as the stigma of the female flower). Silks initiate to elongate around the V12. It stars … Read more

Sowing date: 12/05/2022 Today: 28/07/2022 (78 days from sowing) Current stage: R1 Site: Ontario, Canada Finally corn reached to R1. Now we can see corn silk will appear. Also, we regard corn developmental stage as R1 (silking) when tassels appears. It’s very important silking and tasseling are synchronized timely for successful pollination and fertilization (It … Read more

This post is the summary of the article, ‘Ear Initiation & Size Determination in Corn’ by prof. Bob Nielsen in Purdue University, and therefore all storytelling in this post is based on the article. In a corn plant, kernel number of per ear (KN) is an important contributor to the grain yield potential. Therefore, developmental … Read more

Sowing date: 12/05/2022 Today: 19/07/2022 (69 days from sowing) Current stage: V13-V14 Site: Guelph, Ontario, Canada Now corn is reaching to VT. Sooner or later, tassels will come out and also corn silk will appear. Now it’s so drought. When corn goes through drought stress, they roll up leaves to protect water loss. So, when … Read more

Sowing date: 30/04/2022 Today: 19/07/2022 (81 days from sowing) Current stage: R1 Site: Guelph, Ontario, Canada Corn variety which was planted at the end of April reached R1 stage.