Artikel: Cassava Yield and Economic Response to Fertilizer in Tanzania, Kenya and Ghana
Agronomy journal. 2018 July, v. 110, no. 4
2018
Abstract: Cassava (Manihot esculenta Crantz) is a major food crop in Africa with little information of response to applied nutrients. Our objectives were to: determine cassava yield response to macronutrients for production areas in Ghana, Kenya and Tanzania; ... ...
| Abstract | Cassava (Manihot esculenta Crantz) is a major food crop in Africa with little information of response to applied nutrients. Our objectives were to: determine cassava yield response to macronutrients for production areas in Ghana, Kenya and Tanzania; evaluate the effect Mg, S, Zn and B application; and determine agronomic efficiency (AE) and value cost ratio (VCR) for nutrient application. Fresh storage root yield with no fertilizer averaged 14.4 Mg ha–¹ and mean yield increases due to 80 kg ha–¹ N applied were 8.1, 6.5 and 9.0 Mg ha–¹ in Ghana, Kenya and Tanzania. Storage root yield was increased 93% with P application for Aduma in Ghana and there was a curvilinear to plateau response to K at Wenchi Ghana. No other responses to P and K rates occurred, but an N × P synergism occurred in Tanzania. There were no responses to applied Mg, S, Zn, and B. The VCR for N at all sites was >2 indicating sufficient profit opportunity to make N application attractive to many financially constrained farmers. The mean soil organic C (SOC) was 8 g kg–¹; the results may lose applicability with much higher SOC soils. Over all trials, application of 80 kg ha–¹ N had, on average 8.44 Mg ha–¹ increased yield with 105 kg kg–¹ agronomic efficiency and 7.8 $ $–¹ profit to cost ratio. The results indicate that cassava is efficient in P and K uptake with restricted and little profit potential for P and K application in these countries, respectively. |
|---|---|
| Schlagwörter | Manihot esculenta ; agronomy ; cassava ; fertilizers ; food crops ; soil organic carbon ; synergism ; Ghana ; Kenya ; Tanzania |
| Sprache | Englisch |
| Erscheinungsverlauf | 2018-07 |
| Umfang | p. 1600-1606. |
| Erscheinungsort | The American Society of Agronomy, Inc. |
| Dokumenttyp | Artikel |
| Anmerkung | NAL-AP-2-clean ; epub |
| ZDB-ID | 410332-4 |
| ISSN | 1435-0645 ; 0002-1962 |
| ISSN (online) | 1435-0645 |
| ISSN | 0002-1962 |
| DOI | 10.2134/agronj2018.01.0019 |
| Datenquelle | NAL Katalog (AGRICOLA) |
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