Impact of consolidated utilization of farmyard manure and inorganic fertilizers on yield and yield ingredients of irrigated lowland rice

Abstract

Consolidated utilization of organic and inorganic fertilizers can improve crop productivity and improve soil condition. Investigation research was carried out with an objective to examine the impact of usage of farmyard manure in combination with three levels of chemical fertilizers [80: 40: 30, 120: 60: 45 and 160: 80: 60 kg N, P₂O5 and K₂O ha^-1, respectively] on yield and yield ingredients of irrigated lowland rice. Split-plot design experiment was used during the dry season with and without farmyard manure as main plots and three inorganic fertilizer levels as subplots. Data were collected on grain and straw yield, number of tillers, panicle length, filled grains per panicle, 1000 grain weight and nutrient uptake. The results revealed that application of farmyard manure at 10 t ha-1 increased grain yield of rice by 25% compared to no farmyard manure control. Close examinations were also obtained on straw yield, tiller number, filled grains per panicle, and 1000 grain weight. There were significant relationships between farmyard manure and inorganic fertilizer treatments. The advantageous impacts of use of farmyard manure were not magnified at growth rates of use of inorganic fertilizers. However, the highest grain yield of rice was gotten with the application of farmyard manure at 10 tha^-1 and inorganic fertilizer at 120: 60 : 45 kg N, P₂ O₅ and K₂O ha^-1. The rise in grain yield was due mainly to intense nutrient uptake and number of tillers, filled grains per panicle and 1000-grain weight.