. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. PROFESSIONAL PAPER February 12, 1917 THE MULCHED-BASIN SYSTEM OF IRRIGATED CITRUS CULTURE AND ITS BEARING ON THE CONTROL OF By Lyman J. Briggs, Biophysieist in Charge, C. A. Jensen, Assistant in Plant Malnutrition Investigations, and J. W. McLane, Laboratory Assistant, Office of Biophysical Investigations. CONTENTS. Page. Introduction 1 Cultural practice in the citrus districts of Cali- fornia 3 Plowsole 4 Organic mulching 4 The mulched basin 6 Moisture determinations in the Sunny Moun-
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. PROFESSIONAL PAPER February 12, 1917 THE MULCHED-BASIN SYSTEM OF IRRIGATED CITRUS CULTURE AND ITS BEARING ON THE CONTROL OF By Lyman J. Briggs, Biophysieist in Charge, C. A. Jensen, Assistant in Plant Malnutrition Investigations, and J. W. McLane, Laboratory Assistant, Office of Biophysical Investigations. CONTENTS. Page. Introduction 1 Cultural practice in the citrus districts of Cali- fornia 3 Plowsole 4 Organic mulching 4 The mulched basin 6 Moisture determinations in the Sunny Moun- tain grove 7 Soil-moisture measurements in basins, under cover crops and under a soil mulch in tho Viv- ienda grove 8 Basin and cover-crop experiments in the Vic- toria grove 11 Furrow irrigation often not adequate 13 Lateral movement of soil moisture very 13 Summer cover crops in orange groves not prac- ticable withoutan increased water supply 14 Page. Organic mulches more effective than soil mulches in conserving water 14 Effect of basining on tree growth 15 The mulched basin in relation to soil type 1G Effect of the mulched basins on soil conditions and root growth 17 Fruit setting and tree growth as influenced by the mulching material 18 Size of basins 23 Cost of preparing and maintaining the basins and the mulch 24 Limitations of the mulched-basin system 25 Humus content of the basins and the check soils 26 Summary 28 INTRODUCTION. Orange and lemon trees in California are subject to a functional disturbance known as mottle-leaf, which in its advanced stages results in a marked reduction in the yield and quality of the fruit. The characteristics of mottle-leaf have been discussed in a recent 1 The writers take this opportunity to express their obligation to the University of California Citrus Experiment Station and Graduate School of Tropical Agriculture at Riverside for the courtesies and facilities extended during the course of this work, and to the growers who h
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