University of Maryland Extension


Nutrient management

Urban Ag home | Table of contents Figure 14: Plants take nutrients up through their roots and use them to build their bodies, including the parts we and animals eat. Plants need nutrients, like nitrogen (N), phosphorus (P), and potassium (K), to build their bodies. Different soil amendments add...

Growing Conditions Affecting Potassium Availability

corn leaf with potassium deficiency (chlorosis starting at leaf margin)
Growing Conditions Affecting Potassium Availability Potassium (K) is one of the three primary macronutrients that all plants need to mine from the soil that is necessary for proper growth. On a fertilizer grade analysis, it is the third number listed (in the form of potash) behind phosphorus and...

Why so little yellow shoulders in tomatoes this year?

Typical yellow shoulders problem in tomatoes
Normally at this time of year, I’d be writing about how bad yellow shoulders and other fruit ripening problems are in Maryland tomatoes. But this has been a strange season with May weather in March and March weather in May, which caused a great deal of catfacing problems this year. However, except...
This edition of Agronomy News contains information on potassium and small grains, scotch thistle, orchardgrass decline, minute pirate bug and herbicide news.More info

Nutrient Problems and Their Management in Tomatoes

One of the symptoms of blossom rot on tomatoes
Learn about "Nutrient Problems and Their Management in Tomatoes" through viewing the very detailed and illustrated presentation below.

Tomato Ripening Problems and the Role of Potassium

August 2009 Over the last few months in our area there have appeared problems with tomato ripening. The ripening problems are called various names such as blotchy ripening, yellow shoulder, grey wall, internal whitening, etc (Fig 1). They all have the same root cause; lower levels of potassium (K...
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