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http://dspace.mediu.edu.my:8181/xmlui/handle/123456789/4035| Title: | Potassium supply to cotton roots as affected by potassium fertilization and liming |
| Keywords: | Gossypium hirsutum mass diffusion liming materials roots growth plant nutrition |
| Issue Date: | 30-May-2013 |
| Publisher: | Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
| Description: | Cotton (Gossypium hirsutum) is known to have a high requirement for K and to be very sensitive to low soil pH. Most of K reaches plant roots by diffusion in the soil. As K interacts with Ca and Mg, liming can interfere in K movement in the soil, affecting eventually the plant nutrition. The objective of this work was to study the effect of dolomitic lime and 0, 15, 30, 45 and 60 g kg-1 of K on the supply of K to cotton roots. Cotton plants were grown up to 40 days in 5 L pots containing a Dark Red Latosol (Typic Haplusthox) with 68% and 16% of sand and clay, respectively. There was an increase in dry matter yields and in K accumulation due to K fertilization. Root interception of soil K was also increased by K application, but was not affected by lime. Mass flow and diffusion increased linearly with K levels up to 60 mg kg-1, in pots with lime. In pots without lime the amount of K reaching the roots by diffusion increased up to 45 mg kg-1, but decreased at the highest K level. Accordingly, there was more K reaching the roots through mass flow at the highest K level. This happened because there were more fine roots in pots without lime, at the highest K level. As the roots grew closer, there was a stronger root competition leading to a decrease in the amount of K diffused to cotton roots. |
| URI: | http://koha.mediu.edu.my:8181/jspui/handle/123456789/4035 |
| Other Identifiers: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000500012 http://www.doaj.org/doaj?func=openurl&genre=article&issn=0100204X&date=2003&volume=38&issue=5&spage=635 |
| Appears in Collections: | Agriculture and Food Sciences |
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