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Recovery measures and field management strategies after hailstone damage in upland cotton


 Background

Hailstorm might damage cotton plants severely and cause heavy economic loss in field production. It hailed vehemently three times in 2015 and 2016 in Yellow River Basin Cotton Region and damaged cotton seedling and buds. The apical buds, leaves and stems were damaged as well as boll branches and few flower buds in our experiments. Serials strategies were performed to recover and rescue the cotton plants. Based on evaluating the hailstone damage, we fertilized 112.50 kg/ha Urea fertilizer (N content ≥ 46.4%) and intertilled the field timely.
Results

The recovery of plant individuals sprouted new buds and many new leaves after 12 DAH. Then the unnecessary shoots were pruned to adjust the development of fruit branches. Normally three new boll branches (NBB) in the major stem were reserved and eight subsequent emerging boll branches (EBB) in cotton plants. Five accessions with varied recovery ability and with different yield potential were sampled to compare the yield after hail damage, Sumian 20, 11–0710 and 11–0516 increased, while the other two accessions decreased relative to the normal production without hail damage. BC and RIL populations of upland cotton were used to evaluate the damage ratio of yield, which resulted in yield loss ranged 13.45%-20.27%. Fiber length, fibre elongation, fibre uniformity, and fiber elongation decreased slightly in the five accessions and in two populations.
Conclusions

The present study indicated that different accessions showed varied recovery ability for yield production, but all of them with a decreased ratio less than 20%. In addition, there was no significant effect on fiber quality in different cotton varieties. These results proved that the cotton plants can compensate by proper field managements, and remedial output could be obtained after hail damage.