Tropical agriculture

Worldwide more human beings gain their livelihood from agriculture than any other endeavor; the majority are self-employed subsistence farmers living in the tropics. While growing food for local consumption is the core of tropical agriculture, cash crops (normally crops grown for export) are also included in the definition. When people discuss the tropics, it is normal to use generalized labels to group together similar tropical areas. Common terms would include the humid-tropics (rainforests); the arid-tropics (deserts and dry areas); or monsoon zones (those areas that have well defined wet/dry seasons and experience monsoons). Such labeling is very useful when discussing agriculture, because what works in one area of the world will normally work in a similar area somewhere else, even if that area is on the opposite side of the globe. Most temperate zone agricultural techniques are inappropriate for tropical areas. The second half of the 20th century saw many attempts to duplicate in the tropics farming practices that had been successful in temperate climates. Due to differences in climate, soils, and patterns of land ownership, these largely failed. When they did succeed they tended to heavily favor farmers with substantial land holdings, as a high percentage of temperate agricultural practices are economically "scale-based" and favor large scale production. This in turn pushed many small-scale farmers on to ever more marginal land, as the better quality land was consolidated into larger farms.

Green Revolution The "Green Revolution" was an agricultural improvement program undertaken in the tropics. Funded initially by the Rockefeller Foundation, it aimed to improve corn, rice, and other cereal cultivators – breeding plants that would produce more grain for the same amount of effort. From that point, it expanded out to improved basic farming practices, particularly for rice farmers. The growth of crop yields was such that agriculture was able to outstrip population growth — per capita production increased every year following 1950 - with Asia leading the way. The total cost of the Green Revolution by 1990 was about US$100 million. The Green Revolution had a flaw; although the crops gave more yield, they were more subject to disease, since this was not a primary concern of the program. To address this problem together with an approach to more small-scale farming crops, substantial interest exists today in creating a second Green Revolution, based on sustainable agricultural practices and geared towards (small-scale) farmers with limited financial resources.

Plant propagation Many tropical food plants are propagated by cuttings. Seeds are necessary for plant embryos to survive the winter and other harsh conditions such as drought. However, where the weather is normally conducive to growth year-round, plants reproducing plants through means other than seeds is often advantageous. By bypassing the seed stage, plants can greatly accelerate their reproductive cycles. Despite this, anyone who wishes so, may still grow tropical crops, e.g., fruits, from seeds. To do so, some special seed germination techniques to germinate them more quickly may be best used.

Plant defenses Plants faced conflicting evolutionary pressures: the need to attract pollinators and seed dispensers, and to minimize the damage caused by herbivores. Many (tropical) plants use toxins to protect themselves. Cassava, one of the most important tropical food crops, produces cyanide upon ingestion unless processed to remove/reduce the cyanide content. Other plants are high in oxalates (the agent that binds calcium to form kidney stones); castor beans are the source of ricin, one of the most powerful poisons in existence; and velvet beans contain 3.1-6.1% L-DOPA, which can be toxic in large quantities. The list of toxic plants is long, but toxicity does not always mean a particular plant should be avoided, the knowledge needed to render toxic plants safe to use already exists in most communities.

Slash/mulch The contents of a bag of commercial fertilizer is described in terms of NPK -nitrogen (N), phosphorus (P) and potassium (K); with nitrogen being the main component of most commercial fertilizers. Oxygen is only a small part of the air; the largest component of air is nitrogen. Nitrogen compounds are the main building block of protein; muscle in mammals and plant tissue in plants. If the level of nitrogen compounds in the soil is increased, plant growth can be significantly increased. Legumes are a group of plants that interact with bacteria (rhizobia) in the soil to fix nitrogen from the air into usable compounds, and deposit them into the soil where it is available for other plants to use. The nitrogen compounds deposited by legumes can be readily converted into larger harvests. However, one study of tree growth in the tropics disputes this showing Nitrogen-fixing trees are associated with reduced growth [1][2]. Green manures are plants grown to improve the soil, suppress weeds, limit erosion, and — when legumes are used — to increase the nitrogen content of the soil. The most common type of green manure used in the tropics is velvet bean. It produces a thick blanket of vines and leaves that in addition to infusing the soil with nitrogen, also smothers most weeds. It has reasonable tolerance to drought, low soil fertility, and highly acidic soil. Alternatives to the velvet bean include the lablab bean, the jack bean, and for use above 500 m altitude, the scarlet runner bean. Once the blanket is several centimeters thick, it is chopped down with a machete, and the vines are chopped up. This produces thick mulch on top of the ground that both inhibits weed growth and adds vital nutrients to the soil. Corn or other crops are then planted directly into this mulch. Slash/mulch is popular in southern Mexico, Guatemala, and Honduras; and in recent years has gained a following in many areas of the tropics, from Brazil to central Africa. Where it has been embraced, it has pushed aside slash-and-burn agriculture, and allowed farmers to use the same land continuously for many years. Cornell University has taken a leading role in researching the effects of mulches and slash/mulch practices in the tropics.

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