عنوان

Field trials show the fertilizer value of nitrogen in irrigation water

شماره

LA31w9n70h

زبان متن نوشتاري يا گفتاري و مانند آن

انگلیسی

عنوان اصلي

Field trials show the fertilizer value of nitrogen in irrigation water

نام عام مواد

[Article]

نام نخستين پديدآور

Cahn, Michael; Smith, Richard; Murphy, Laura; Hartz, Tim

متن يادداشت

Increased regulatory activity designed to protect groundwater from degradation by nitrate-nitrogen (NO₃-N) is focusing attention on the efficiency of agricultural use of nitrogen (N). One area drawing scrutiny is the way in which growers consider the NO₃-N concentration of irrigation water when determining N fertilizer rates. Four drip-irrigated field studies were conducted in the Salinas Valley evaluating the impact of irrigation water NO₃-N concentration and irrigation efficiency on the N uptake efficiency of lettuce and broccoli crops. Irrigation with water NO₃-N concentrations from 2 to 45 milligrams per liter were compared with periodic fertigation of N fertilizer. The effect of irrigation efficiency was determined by comparing an efficient (110% to 120% of crop evapotranspiration, ET_c) and an inefficient (160% to 200% of ET_c) irrigation treatment. Across these trials, NO₃-N from irrigation water was at least as efficiently used as fertilizer N; the uptake efficiency of irrigation water NO₃-N averaged approximately 80%, and it was not affected by NO₃-N concentration or irrigation efficiency.

تاريخ نشر

2017

عنوان

California Agriculture

شماره جلد

71/2

عنصر شناسه اي

Cahn, Michael; Smith, Richard; Murphy, Laura; Hartz, Tim

نام الکترونيکي

نوع ماده

[Article]

کد کاربرگه

275578

سطح دسترسي

a

تكميل شده

Y