期刊
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
卷 181, 期 5, 页码 644-654出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jpln.201700455
关键词
irrigation; macro-nutrients; Manihot esculenta; root crops; starch
资金
- African Development Bank through International Institute of Tropical Agriculture
- Israel Chemical Limited through International Potash Institute
- Center for Fertilization and Plant Nutrition
Response of cassava (Manihot esculenta Crantz) to fertigation as a form of nutrient delivery is unknown. The objectives of this study were to establish a balanced nutrition and to enhance agronomic nutrient use efficiency (ANUE) of cassava under fertigation. This study was conducted in the greenhouse and in the field. In both, the results showed a similar trend. There were six fertigation concentrations and three cassava varieties, selected for their duration of growth in the field. Shoot biomass of the long-duration variety (Nalumino) was the highest, even though its dry root yield was the lowest (10.18 t ha(-1)) among the varieties. In contrast, the medium-duration variety (Kampolombo) produced the highest dry root yield (20.34 t ha(-1)) and a lower shoot biomass. The highest root yield of the shortest-duration variety (Mweru) was achieved at 200 mg N, 30 mg P, and 200 mg K L-1 (155.0, 23.3, 155.0 kg N, P, K ha(-1)), while Nalumino's was at 70mgN, 7 mg P, and 70 mg K L-1 (54.3, 5.4, 54.3 kg N, P, K ha(-1)). ANUE and harvest index of these varieties declined as the fertigation concentrations increased. Additionally, the correlation between concentrations of N in the youngest fully expanded leaf (YFEL) blades and dry root yields was the lowest (R-2 = 0.5488), whereas P and K were R-2 = 0.7237 and R-2 = 0.8006, respectively, an indication that nutrient concentrations in the leaf, especially N, cannot easily be used to predict root yield. When cassava reaches nutrient sufficiency, mainly N, its accumulation in the leaf continues without significant increase in the root yield.
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