By T. Breimer

The current research was once conducted within the interval 1977-1981 on the division of Soil technological know-how and Plant meals of the rural collage Wageningen, Netherlands. This college provided the main monetary sup­ port via a study provide, with extra monetary aid rendered via the Dutch Nitrogen Fertilizer and Unilever study, Netherlands. This help is gratefully stated. within the current shape this file is the author's doctoral dissertation submitted to the school of the Agricul­ tural collage. the writer hereby needs to thank prof. dr. ir. A. van Diest for his criti­ cal studying and correction of the English textual content, and drjr. J. H. G. Slangen for his worthy advices throughout the investigations and through the training of this file. The au thor additionally recognizes the precious aid got from numerous Agricultural examine Institutes and collage leave­ ments which made amenities and manpower to be had to behavior the ex­ periments and to rework the consequences got into the current document. Contents Preface / v summary / 1 checklist of ab breviations / 2 advent / three 2 Literature / 6 2. 1 Nitrogen modifications in soil / 7 2. 2 Nitrate uptake / 7 Nitrate aid in vegetation / 7 2. three 2. four Nitrate contents in vegetation / eight 2. five Cultural measures / nine 2. five. 1 Nitrogen dressing / nine 2. five. 1. 1 Nitrogen quantity / nine 2. five . 1.

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Extra resources for Environmental Factors and Cultural Measures Affecting The Nitrate Content In Spinach

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Nitrapyrin: 100 ml N-serve 24E per kg N (= about 2% nitrapyrin) for all ratios; without nitrapyrin for the ratios 0: 3 and 3: O. [26] Soil sampling dates: 31 July, 21 August,S, 19 and 26 September on fallow plots without nitrogen dressings. After the harvest, plots with N0 3-N only (without nitrapyrin) were also sampled. Experiment 5,1979 On 23 March, P (66 kg P as triple superphosphate) and K (66 kg K as K-60) were applied per ha. Sowing date: 27 April. Variety: Estivato. Emergence date: 10 May.

Oct. 2 Global radiation per day recorded at Wageningen during the periods April-July 1977, March-September 1978, March-November 1979 and February-November 1980 (from 13 to 31 October 1980 no data available due to translocation of weather station). 700 C for at least 20 hours (from the indoor experiments all fresh material was dried). Subsamples of all 1979 experiments had to be washed with deionized water to remove soil particles. The dried plant material was weighed, ground through a I-mm sieve and stored in air-tight plastic bags for chemical analysis.

5 g N per pot) were available as N0 3 after a 65-day incubation for NH4 -N without inhibitor, NH4 -N with 30 and 90 mg DCD per pot and NH4 -N with 30 and 90 mg nitrapyrin per pot, respectively (Experiment 6). In the same order, spinach yields were reduced by 16, 10,26,33 and 74% compared with the yield of a N0 3 -dressed crop. 3). 2 Light in tensity- and temperature effects with different amounts of nitrogen and varying N03 :NH4 -ratios Variations in quantity of N-dressing and in N0 3 -N:NH 4-N-ratio did not affect dry-matter yields in experiment 7 (Table 9).

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