Conocarpus Biochar Induces Changes in Soil Nutrient Availability and Tomato Growth Under Saline Irrigation  

作　　者：Adel Rabie A.USMAN Mohammad I.AL-WABEL Yong S.OK Abdulaziz AL-HARBI Mahmoud WAHB-ALLAH Ahmed Hamdy EL-NAGGAR Mahtab AHMAD Abdulelah AL-FARAJ Abdulrasoul AL-OMRAN 

机构地区：[1]Soil Sciences Department,College of Food Agricultural Sciences,King Saud University,P.O.Box 2460,Riyadh 11451(SaudiArabia) [2]Department of Soils and Water,Faculty of Agriculture,Assiut University,Assiut 71526(Egypt) [3]Korea Biochar Research Center,Kangwon National University,Chunehon 200-701(Korea) [4]lant Production Department,College of Food and Agricultural Sciences,King Saud University,P.O.Box 2460,Riyadh 11451(Saudi Arabia) [5]Vegetable Crops Department,Faculty of Agriculture,Alexandria University,Alexandria 21321(Egypt) [6]Department of Soil Science,Faculty of Agriculture,Ain Shams University,68 HadayekShobra,P.O.Box 11241,Cairo 11241(Egypt) [7]Agricultral Engineering Department,College of Food&Agricultural Sciences,King Saud University,P.O.Box 2460,Riyadh 11451(Saudi Arabia)

出　　处：《Pedosphere》2016年第1期27-38,共12页土壤圈（英文版）

基　　金：King Abdulazaiz City of Science and Technology(KACST)(grant no:AT-34-392),Riyadh,Kingdom of Saudi Arabia

摘　　要：Thermally modified organic materials commonly known as biochar have gained popularity of being used as a soil amendment.Little information, however, is available on the role of biochar in alleviating the negative impacts of saline water on soil productivity and plant growth. This study, therefore, was conducted to investigate the effects of Conocarpus biochar(BC) and organic farm residues(FR) at different application rates of 0.0%(control), 4.0% and 8.0%(weight/weight) on yield and quality of tomatoes grown on a sandy soil under drip irrigation with saline or non-saline water. The availability of P, K, Fe, Mn, Zn and Cu to plants was also investigated. The results demonstrated clearly that addition of BC or FR increased the vegetative growth, yield and quality parameters in all irrigation treatments. It was found that salt stress adversely affected soil productivity, as indicated by the lower vegetative growth and yield components of tomato plants. However, this suppressing effect on the vegetative growth and yield tended to decline with application of FR or BC, especially at the high application rate and in the presence of biochar. Under saline irrigation system, for instance, the total tomato yield increased over the control by 14.0%–43.3% with BC and by 3.9%–35.6% with FR. These could be attributed to enhancement effects of FR or BC on soil properties, as indicated by increases in soil organic matter content and nutrient availability. Therefore, biochar may be effectively used as a soil amendment for enhancing the productivity of salt-affected sandy soils under arid conditions.Thermally modified organic materials commonly known as biochar have gained popularity of being used as a soil amendment. Little information, however, is available on the role of biochar in alleviating the negative impacts of saline water on soil productivity and plant growth. This study, therefore, was conducted to investigate the effects of Conocarpus biochar （BC） and organic farm residues （FR） at different application rates of 0.0% （control）, 4.0% and 8.0% （weight/weight） on yield and quality of tomatoes grown on a sandy soil under drip irrigation with saline or non-saline water. The availability of P, K, Fe, Mn, Zn and Cu to plants was also investigated. The results demonstrated clearly that addition of BC or FR increased the vegetative growth, yield and quality parameters in all irrigation treatments. It was found that salt stress adversely affected soil productivity, as indicated by the lower vegetative growth and yield components of tomato plants. However, this suppressing effect on the vegetative growth and yield tended to decline with application of FR or BC, especially at the high application rate and in the presence of biochar. Under saline irrigation system, for instance, the total tomato yield increased over the control by 14.0%-43.3% with BC and by 3.9%-35.6% with FR. These could be attributed to enhancement effects of FR or BC on soil properties, as indicated by increases in soil organic matter content and nutrient availability. Therefore, biochar may be effectively used as a soil amendment for enhancing the productivity of salt-affected sandy soils under arid conditions.

关 键 词：drip irrigation organic farm residues organic matter content salt stress sandy soils soil amendment soil productivity 

分 类 号：S158[农业科学—土壤学] S641.2[农业科学—农业基础科学]