Cassava Response to Phosphorus Fertilizer in Warin Soil Series Amended with Cassava Tails and Stalk-Bentonite Mixture

A field experiment was conducted in a farmer Nakhon Ratchasima province, northeast, Thailand objectively to investigate the response of cassava, Huay Bong 80 variety phosphorus (P) fertilizer Warin soil series (classified as Grossarenic Paleustults) amended with cassava tails and stalk (CTS) mixed bentonite (BTN). The arranged split plot four replications. Main consisted rates CTS +BTN: 0+0, 6.25+1.25, 12.5+2.5 25+5 t/ha while subplot comprising P fertilizer: 0, 25, 50 100 kg P2O5/ha. Cassava harvested at 12-month age plant samples were collected harvesting time study effects amendment on uptake primary nutrients different parts cassava. results showed that CTS+BN mixture rate highly significantly promoted highest fresh tuber yield (FTY) starch (SY) 31.79 8.97 t/ha, respectively, which 21.2 20.7 % greater than control no addition. Increasing fertilization induced FTY, SY aboveground biomass (ABG) did zero-P fertilization. Amending along addition P2O5/ha interactively gave respective ABG 39.76, 11.48 17.35 whereas CTS+BN/ha plus slightly lower STY 36.11 10.30 respectively. former combined also had interaction all whole plant, accounting for 131.66, 14.23 124.13 kg/ha nitrogen, phosphorus, potassium. result reaffirmed amending proper CTS+BTN enhanced efficiency subsequently improved HIGHLIGHTS Coarse-textured soils northeast are very poor physically chemically, leading low planted Improving amendments can be beneficial an increase series, one coarse-textured this region, + yield, GRAPHICAL ABSTRACT