Improving Soil Fertility
Research on farms in Thailand, Laos and the Philippines has confirmed what scientists had long suspected: that a lack of phosphorus in upland farms is limiting rice crop yields. Their suspicions arose from the fact that many highly weathered upland soils are inherently low in phosphorus and are acidic.
But the scientists found that the lack of phosphorus will limit production even if calcium is added to the soil to overcome the acidity, or if acid-tolerant cultivars are planted. Rotations of rice and legumes could lead to stable, higher value production, they concluded. But first it is necessary to ensure by adding phosphorus that soil quality does not degrade over time.
Eventually, the investment in soil inputs should pay off as added phosphorus exceeds crop needs and as other nutrients such as carbon and nitrogen are better cycled and used.
Read more about this topic: Upland Rice
Famous quotes containing the words improving, soil and/or fertility:
“I know of no pursuit in which more real and important services can be rendered to any country than by improving its agriculture, its breed of useful animals, and other branches of a husbandman’s cares.”
—George Washington (1732–1799)
“The point of the dragonfly’s terrible lip, the giant water bug, birdsong, or the beautiful dazzle and flash of sunlighted minnows, is not that it all fits together like clockwork--for it doesn’t ... but that it all flows so freely wild, like the creek, that it all surges in such a free, finged tangle. Freedom is the world’s water and weather, the world’s nourishment freely given, its soil and sap: and the creator loves pizzazz.”
—Annie Dillard (b. 1945)
“I will go root away
The noisome weeds which without profit suck
The soil’s fertility from wholesome flowers.”
—William Shakespeare (1564–1616)