By T. Breimer
The current research used to be conducted within the interval 1977-1981 on the division of Soil technology and Plant food of the rural collage Wageningen, Netherlands. This college provided the key monetary sup port via a examine supply, with extra monetary aid rendered by way of the Dutch Nitrogen Fertilizer and Unilever learn, Netherlands. This help is gratefully stated. within the current shape this record is the author's doctoral dissertation submitted to the college of the Agricul tural collage. the writer hereby needs to thank prof. dr. ir. A. van Diest for his criti cal analyzing and correction of the English textual content, and drjr. J. H. G. Slangen for his beneficial advices in the course of the investigations and through the education of this file. The au thor additionally recognizes the precious help got from a number of Agricultural examine Institutes and collage go away ments which made amenities and manpower on hand to behavior the ex periments and to rework the consequences received into the current document. Contents Preface / v summary / 1 record of ab breviations / 2 advent / three 2 Literature / 6 2. 1 Nitrogen variations in soil / 7 2. 2 Nitrate uptake / 7 Nitrate relief in crops / 7 2. three 2. four Nitrate contents in crops / eight 2. five Cultural measures / nine 2. five. 1 Nitrogen dressing / nine 2. five. 1. 1 Nitrogen volume / nine 2. five . 1.
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Extra resources for Environmental Factors and Cultural Measures Affecting The Nitrate Content In Spinach
In one grouf of trials highest yields per harvest were in the range of 150-175 g per m (exp. 1B, 31 days after emergence and expo 3,24 and 26 days after emergence), in a second group the highest yields ranged from 200 to 250 g per m 2 (exp. 1B, 37 days after emergence, exps. 3, 30 days after emergence) and in a third group the highest yields ranged from 290 to 350 g per m 2 (exp. 1B, 44 days after emergence and exps. 5, 6 and 7) (Table 12, part d). Dry-matter yields were closely correlated with fresh yields.
Harvest dates: 17 and 24 April. Trial site: heated glasshouse (17°C). 5-1 pots were used with about 1 kg of a commercial potting mixture. 38 g (N0 3 +NH4 )-N (KCl-extraction). 0 and available P, K and Mg were high. Per pot 1 plant was grown. The experiment was arranged in 4 blocks with 5 pots per block. The experiment was carried out at the Institute for Horticultural Plant Breeding, Wageningen. Varieties were kindly supplied by drjr. H. Eenink of this Institute. Remarks: In the experiments with N-, po, or K-supplies as variables the other nutrients were applied in sufficient amounts before sowing; high amounts of Nand K were applied in split dressings.
Although the (C-A)- and org N-contents varied for leaves of different ages, the (C-A):org N-ratio was about one for the aerial parts of plants with a high nitrate supply. With a low nitrate supply, the same was true until N0 3 became depleted. \t::,. 3000 2000 fOOO 59 days after emergence 45 • \ t::,. \ t::,. "..... 7 N03-contents in laminae and petioles of spinach leaves of different age for two levels of N03-supply (Experiment 1). 8 (C-A) and org N-contents in laminae and petioles of spinach leaves of different age at two levels of N03-supply, 59 days after emergence (Experiment 1).