Yield and protein content of hybrid corn (Pioneer X 304) as influenced by timing of nitrogen application.
1970
Shukla G.C.
Studies were undertaken to find out the suitable time of N application in relation to yield and protein content at 2 sites, on onverwagt clay and on inki clay soil. The treatments applied in a randomized block design with 4 replications were as follows: control - no nitrogen, N full at planting (P), N full when the plants are knee high (KH), N full at tasseling (T), N half at P + half at KH, N half at P + half at T, N half at KH + half at T and N one-third at P + one-third at KH + one-third at T. A rate of 135 kg N/ha was used in all N treated plots. Based on the results over 2 seasons, it has been concluded that full application of nitrogen at a rate of 135 kg N/ha at planting is too early and excessive and similarly full application at tasseling is too late; for both sites it is desirable to add N in 2 split doses at planting and knee high stage or at knee high stage and tasseling. At the second site, on inki clay soil, N applied in 3 split doses at planting, knee high stage and at tasseling appeared to be equally effective. Protein content was increased slightly at the first site (onverwagt clay) but the effect was not significant for both seasons. At the second site (inki clay), increases were significant for both seasons. It is noted that differences were significant between different timings of N application only and not as compared to the control.
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