Development of a nitrogen soil test for fertilizer requirements for corn and wheat production in Quebec
نام عام مواد
[Thesis]
نام نخستين پديدآور
M. R. Miransari Mahabadi
نام ساير پديدآوران
A. F. Mackenzie
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
McGill University (Canada)
تاریخ نشرو بخش و غیره
1995
مشخصات ظاهری
نام خاص و کميت اثر
127
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
M.Sc.
کسي که مدرک را اعطا کرده
McGill University (Canada)
امتياز متن
1995
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
One must consider the effects of both soil N and fertilizer N, if rates of N-fertilizer application are to be optimized and NO3\sp- leaching into groundwater be controlled. Objectives were (1) to determine soil usd\rm NO\sb3\sp-usd-N and NH4\sp+-N, soil total N, and N fertilizer levels and corn and wheat yields; and, (2) to determine soil sampling times and depths for N analyses that correlated with yields and fertilizer N response. Soil samples taken at seeding and postseeding were analyzed for NH4\sp+-N and NO3\sp--N, and for total N in 29 wheat sites and 44 corn sites fertilized with four rates of N. N-Trak (quick test) and laboratory methods were employed to measure soil NO3\sp--N. A significant correlation was found between N-Trak and laboratory methods (R2 = 0.61 for corn and 0.89 for wheat). Compared to the laboratory method, N-Trak overestimated soil NO3\sp--N. Soil NO3\sp--N levels increased upon drying. In some cases soils showed an increase in soil NO3\sp--N from seeding to postseeding. Wheat yields and wheat grain N uptake were better correlated with soil NO3\sp--N at seeding than at postseeding. For corn, yields and grain uptake showed a higher correlation with soil NO3\sp--N at postseeding. Corn regression models predicted 180 to 240 kg ha of N fertilizer to obtain optimum economic yields and 0 to 40 kg ha N for wheat. Soil total N was not correlated with corn yields as highly as soil NO3\sp--N. Soil NO3\sp--N can be used as an indicator of fertilizer N requirements for corn and wheat in Quebec.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Agronomy
موضوع مستند نشده
Biological sciences
موضوع مستند نشده
Soil sciences
موضوع مستند نشده
Soil sciences
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )