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The significance of root growth on cotton nutrition in an acidic low-P soil

机译：酸性低磷土壤中根系生长对棉花营养的意义

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Toxic levels of Al and low availability of Ca have been shown to decrease root growth, which can also be affected by P availability. In the current experiment, initial plant growth and nutrition of cotton (Gossypium hirsutum var. Latifolia) were studied as related to its root growth in response to phosphorus and lime application. The experiment was conducted in Botucatu, Sao Paulo, Brazil, in pots containing a dark red latosol (Acrothox, 20% clay, 72% sand). Lime was applied at 0.56, 1.12 and 1.68gthinkg-1 and phosphorus was applied at 50, 100 and 150 mgthinkg-1. Two cotton (cv. IAC 22) plants were grown per pot for up to 42 days after plant emergence. There was no effect of liming on shoot dry weight, root dry matter yield, root surface and length, but root diameter was decreased with the increase in soil Ca. Shoot dry weight, as well as root length, surface and dry weight were increased with soil P levels up to 83 mgthinkg-1. Phosphorus concentration in the shoots was increased from 1.6 to 3.0gthinkg-1 when soil P was increased from 14 to 34 mgthinkg-1. No further increases in P concentration were observed with higher P rates. The shoot:root ratio was also increased with P application as well as the amount of nutrients absorbed per unit of root surface. In low soil P soils the transport of the nutrient to the cotton root surface limits P uptake. In this case an increase in root growth rate due to P fertilization does not compensate for the low P diffusion in the soil.
机译：铝的有毒水平和钙的低利用率已表明会降低根的生长，这也可能受磷的利用率影响。在当前的实验中，研究了棉花（Gossypium hirsutum var。Latifolia）的初始植物生长和营养状况，这与棉花对磷和石灰的响应根系生长有关。该实验是在巴西圣保罗的Botucatu的装有深红色Latosol（Acrothox，20％粘土，72％沙子）的盆中进行的。分别以0.56、1.12和1.68gthinkg-1施用石灰，并以50、100和150mgthinkg-1施用磷。植株出苗后，每盆最多种植两株棉花（cv。IAC 22）。石灰对茎干重量，根系干物质产量，根系表面和长度没有影响，但根系直径随土壤Ca的增加而减小。土壤P含量最高到83 mgthinkg-1时，地上部干重以及根长，表面和干重均增加。当土壤磷从14 mgthinkg-1增加到34 mgthinkg-1时，芽中的磷浓度从1.6gthinkg-1增加到3.0gthinkg-1。较高的磷比率未观察到磷浓度的进一步增加。施用磷以及增加单位根表面吸收的养分含量也增加了枝根比。在低磷土壤中，养分向棉花根部表面的运输限制了磷的吸收。在这种情况下，由于施磷导致根系生长速率的增加不能弥补土壤中低磷的扩散。

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