عنوان

Growth and nitrogen(2) fixation in soybean and nitrification as affected by nitrogen source and a nitrification inhibitor

شماره

TLpq303907805

زبان متن نوشتاري يا گفتاري و مانند آن

انگلیسی

عنوان اصلي

Growth and nitrogen(2) fixation in soybean and nitrification as affected by nitrogen source and a nitrification inhibitor

نام عام مواد

[Thesis]

نام نخستين پديدآور

M. A. Zahid

نام ساير پديدآوران

F. E. Koehler

نام ناشر، پخش کننده و غيره

Washington State University

تاریخ نشرو بخش و غیره

1990

نام خاص و کميت اثر

104

جزئيات پايان نامه و نوع درجه آن

Ph.D.

کسي که مدرک را اعطا کرده

Washington State University

امتياز متن

1990

متن يادداشت

Fertilizer nitrogen management and evaluation of N2 fixing capabilities of legumes are crucial for better crop production and to reduce environmental pollution. A laboratory, a greenhouse and a field experiment were conducted using different N sources with or without nitrapyrin, a nitrification inhibitor. Soybean was grown as a test crop in the latter two experiments. The main purpose of the laboratory experiment was to determine an appropriate form and rate of N to be used in experiments with legumes based on NH4\sp{+}-N retained due to nitrapyrin. Soils receiving nitrapyrin-treated N retained higher NH4\sp{+}-N for up to 68 days and effectiveness followed the order: Ammonium Sulfate > Ammonium Nitrate > Urea. Higher percentage of NH4\sp{+}-N was retained at a lower N rate both at 25 and 68 days sampling. Addition of nitrapyrin minimized the decrease of soil pH caused by nitrification of added N. Greenhouse and field studies were aimed at evaluating growth and N2 fixation of soybean. It was hypothesized that application of low levels of fertilizer N and nitrapyrin may increase the amount of N fixed biologically. Ammonium sulfate at 20 mg N Kg significantly increased while CN decreased the nodule number, nodule weight and seed yield in soybean. Nitrogen fixation as estimated by N isotope dilution and by difference was significantly higher for AS than urea or CN and for addition of nitrapyrin. The two methods were similar in their estimates of N2 fixed. Interaction between N source and inhibitor was not significant, however, the maximum N2 fixation was achieved for plots receiving inhibitor-treated AS.

موضوع مستند نشده

Agricultural engineering

موضوع مستند نشده

Agronomy

موضوع مستند نشده

Applied sciences

موضوع مستند نشده

Biological sciences

موضوع مستند نشده

nitrogen fixation

مستند نام اشخاص تاييد نشده

F. E. Koehler

مستند نام اشخاص تاييد نشده

M. A. Zahid

نام الکترونيکي

فرمت انتشار

p

نوع ماده

[Thesis]

کد کاربرگه

276903

سطح دسترسي

a

تكميل شده

Y