Yield Responses of Upland Rice Varieties to Low N Conditions in Central Kenya

IF 1.7 4区农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY

Journal of Agricultural Science Pub Date : 2023-05-15 DOI:10.5539/jas.v15n6p19

Sammy Kagito, Mayumi Kikuta, H. Samejima, J. Gweyi-Onyango, E. Gikonyo, E. Gichuhi, D. Menge, J. Kimani, A. Yamauchi, D. Makihara

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Abstract

Growth, yield, and yield components of five upland rice varieties (MWUR 1, MWUR 4, NERICA 1, NERICA 4, and IRAT109) were evaluated under four different soil N conditions (0, 26, 52, and 78 kg N/ha) to identify the factors contributing to their adaptability to low soil-fertility. The results showed that MWUR 1, MWUR 4, and NERICA 4 had greater adaptability to low N conditions. Specifically, MWUR 1 showed the highest adaptability to low soil fertility. The greater low soil-fertility adaptability of these varieties was attributed to their ability to maintain dry matter production. Furthermore, their greater dry matter production under low N conditions could be attributed to the increased root length, which allowed improved soil nutrient absorption. Our findings suggest that rice grain yield was mainly restricted by sink size, particularly panicle number per plant under low N conditions. The higher grain yield of MWUR 1 under low N conditions could be attributed to greater tillering ability. Thus, MWUR 1 could be a good candidate for cultivation under nutrient-poor soil conditions.

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肯尼亚中部旱稻品种对低氮条件的产量响应

通过对5个旱稻品种(MWUR 1、MWUR 4、NERICA 1、NERICA 4和IRAT109)在4种不同N/ha(0、26、52和78 kg N/ha)条件下的生长、产量和产量构成进行评价，以确定其对低土壤肥力的适应性因素。结果表明，MWUR 1、MWUR 4和NERICA 4对低氮条件具有较强的适应性。其中，mwur1对低土壤肥力的适应性最强。这些品种较强的低土壤肥力适应性归因于它们保持干物质生产的能力。此外，在低氮条件下，它们更大的干物质产量可能归因于根系长度的增加，从而促进了土壤养分的吸收。研究结果表明，在低氮条件下，水稻产量主要受库大小，尤其是单株穗数的限制。低氮条件下mwur1的高产可能与分蘖能力强有关。因此，mwur1可能是养分贫乏土壤条件下栽培的良好候选者。

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来源期刊

Journal of Agricultural Science 农林科学-农业综合

CiteScore

2.80

自引率

5.00%

发文量

审稿时长

1.4 months

期刊介绍： The Journal of Agricultural Science publishes papers concerned with the advance of agriculture and the use of land resources throughout the world. It publishes original scientific work related to strategic and applied studies in all aspects of agricultural science and exploited species, as well as reviews of scientific topics of current agricultural relevance. Specific topics of interest include (but are not confined to): all aspects of crop and animal physiology, modelling of crop and animal systems, the scientific underpinning of agronomy and husbandry, animal welfare and behaviour, soil science, plant and animal product quality, plant and animal nutrition, engineering solutions, decision support systems, land use, environmental impacts of agriculture and forestry, impacts of climate change, rural biodiversity, experimental design and statistical analysis, and the application of new analytical and study methods (including genetic diversity and molecular biology approaches). The journal also publishes book reviews and letters. Occasional themed issues are published which have recently included centenary reviews, wheat papers and modelling animal systems.