Asparagus Yield Response to Water and Nitrogen

摘要: ABSTRACT FRESH green asparagus {Asparagus officinalis L.) is produced in the Southwest desert regions during a period when it cannot be colder areas. The success of producing optimum yields economically dependent on proper applications water and nitrogen. All requirements must met by irrigation since less than 75 mm (3 in.) annual rainfall occurs this region. Nitrogen critical nutrient that applied to obtain maximum yields. Maximum 11.6, 18.6, 10.0 Mg/ha(9700, 16,700, 8900 Ib/ac) were predicted for crowns 3, 4 5 years old, respectively. amount these ranged from 270 310 cm (106 122 nitrogen fertilizer 370 630 kg/ha (330 560 Ib/ac). Production functions developed predict 50 150% estimated evapotranspiration 33 167% recommended rate. A generalized prediction equation was calculated normalizing yield, amounts applied. total seasonal depletion rate 2500 (98 fern growing season. Water at level would result relative yield 0.98. soil 14 (0.55 in.)/day measured season late June through early August. An average 0.4 (0.01 harvest Irrigations may not required replenish moisture but other cultura practices.