Palanivell Perumal, Ahmed Osumanu Haruna, Ab Majid Nik Muhamad, Jalloh Mohamadu Boyie, Susilawati Kasim
Department of Crop Science, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia Bintulu Sarawak Campus, 97008 Bintulu, Sarawak, Malaysia.
Department of Crop Science, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia Bintulu Sarawak Campus, 97008 Bintulu, Sarawak, Malaysia ; Agriculture and Environment, Borneo Eco-Science Research Center, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia Bintulu Sarawak Campus, 97008 Bintulu, Sarawak, Malaysia ; Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia.
ScientificWorldJournal. 2015;2015:906094. doi: 10.1155/2015/906094. Epub 2015 Apr 21.
High cation exchange capacity and organic matter content of crude humic substances from compost could be exploited to reduce ammonia loss from urea and to as well improve rice growth and soil chemical properties for efficient nutrients utilization in lowland rice cultivation. Close-dynamic air flow system was used to determine the effects of crude humic substances on ammonia volatilization. A pot experiment was conducted to determine the effects of crude humic substances on rice plant growth, nutrients uptake, nutrients recovery, and soil chemical properties using an acid soil mixed with three rates of crude humic substances (20, 40, and 60 g pot(-1)). Standard procedures were used to evaluate rice plant dry matter production, nutrients uptake, nutrients recovery, and soil chemical properties. Application of crude humic substances increased ammonia volatilization. However, the lowest rate of crude humic substances (20 g pot(-1)) significantly improved total dry matter, nutrients uptake, nutrients recovery, and soil nutrients availability compared with crude humic substances (40 and 60 g pot(-1)) and the normal fertilization. Apart from improving growth of rice plants, crude humic substances can be used to ameliorate acid soils in rice cultivation. The findings of this study are being validated in our ongoing field trials.
堆肥中粗腐殖质的高阳离子交换容量和有机质含量可用于减少尿素的氨损失，并改善水稻生长和土壤化学性质，以提高低地水稻种植中养分的有效利用率。采用密闭动态气流系统来测定粗腐殖质对氨挥发的影响。进行了盆栽试验，以确定粗腐殖质对水稻植株生长、养分吸收、养分回收率和土壤化学性质的影响，使用的是与三种粗腐殖质施用量（20、40和60克/盆）混合的酸性土壤。采用标准程序评估水稻植株干物质产量、养分吸收、养分回收率和土壤化学性质。施用粗腐殖质增加了氨挥发。然而，与粗腐殖质（40和60克/盆）及常规施肥相比，最低施用量的粗腐殖质（20克/盆）显著提高了总干物质、养分吸收、养分回收率和土壤养分有效性。除了促进水稻植株生长外，粗腐殖质还可用于改良水稻种植中的酸性土壤。本研究结果正在我们正在进行的田间试验中得到验证。
