Split Nitrogen applications beneficial to castor

Split Nitrogen applications beneficial to castor

Postby cacofonix » Mon Dec 29, 2008 9:56 am

Here's an abstract of a research on N requirements for castor crop:

"The effects of different rates and methods of N fertilizer application were assessed at five sites over two seasons (1987/88 and 1988/89). Fertilizer rates of 0, 30, 60, 90 and 120 kg N ha^-1 were applied in a single dose at planting or in two splits, half applied at planting and the other half as topdressing at primary floral initiation. The sites at Makoholi, Mlezu and Matopos were on sandy soils in low rainfall areas while those at Kadoma and Panmure were in sandy clay loam soils in higher rainfall areas. There were significant interactions between N rate and season on seed yield in the sandy soils except at Makoholi. The effect of N rate on these parameters contrasted at each site between the two seasons, indicating that the amount of N fertilizer needed for castor (Ricinus communis L.) on the sandy soils depended on the amount of rainfall. Application of N in a single dose did not significantly increase seed yield when available soil N was medium to high (> 24 ppm) except at Kadoma where application of 30 kg N ha^-1 increased yield when soil N status was rated as medium. Yield responses to N applied at planting in 1987/88 at Matopos and Panmure and in 1988/89 at Makoholi and Mlezu indicated that 60 kg N ha^-1 was the optimum application rate for castor. When compared to a single dose, splitting N application enhanced its effectiveness in increasing yield in 1987/88 at Mlezu and Matopos, and at Kadoma in two seasons. These results suggest that split N applications are beneficial to castor when seasonal rainfall is greater than 700mm."

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