Production Agriculture

Too much of a good thing can be a bad thing. That’s certainly true for nitrogen fertilizers.

Without enough nitrogen, crops don’t grow well. Yields are reduced significantly.

Applying too much nitrogen fertilizer, on the other hand, can hurt the environment. Nitrogen can enter the watershed, polluting aquatic ecosystems. Microbes can also convert the excess nitrogen into nitrous oxide, a greenhouse gas implicated in climate change.

In the early 1990s, Acton Lake in southwestern Ohio had a muddy problem. Large amounts of sediment from nearby farms were entering the lake’s watershed. These sediments traveled through streams draining the landscape and were filling up the lake.

So, the USDA gave local farmers incentives to change some of their farming practices. One of these practices was conservation tillage, in which the soil is plowed less often. That can reduce sediment runoff.

When you think of China, do you think of potatoes? Maybe not, but in the Loess Plateau region of northwestern China, potato is the main food crop.

Spring in America’s heartland is often wet. That makes its soil too soft for planting. One solution to that issue is tile drainage. Growers insert a series of pipes (drain tiles) under their fields, which drains water from the soil into nearby streams and lakes. 

Coffee is one of Brazil’s biggest crops. Brazil’s favorable climate helps coffee beans ripen and be ready for picking during a concentrated period of weeks. This makes mechanical harvesting an economically reasonable choice.

A tiny pest can cause huge losses to soybean farmers.

Several top soybean producing states in the U.S. are in the Upper Midwest. In these states, an insect–the soybean aphid–is a damaging pest. Each year, soybean aphids cause billions of dollars in crop losses. 

Some relationships can be complicated. Take the one between sweet potato crops and soil nitrogen, for example.

Too little nitrogen and sweet potato plants don’t grow well and have low yields. Too much nitrogen, however, boosts the growth of leaves and branches at the expense of storage roots. That also leads to low yields.

Plants can’t do without phosphorus. But there is often a ‘withdrawal limit’ on how much phosphorus they can get from the soil. That’s because phosphorus in soils is often in forms that plants can’t take up. That affects how healthy and productive the plants can be.

The world produces more corn by weight than any other cereal crop. Corn, also known as maize, is a staple food in many countries. But farmers growing corn face many challenges, such as drought, diseases, and pests.

Outside Asia, no country produces as much rice as does Brazil. It is the ninth largest rice producer in the world. Average annual yields are close to 15 million tons.

Rice production in Brazil is a multi-billion dollar industry. It employs hundreds of thousands of people, directly and indirectly.